2016 Volkswagen Passat TSI Engine Analysis and Insights


Intro
The 2016 Volkswagen Passat TSI engine stands out as an interesting example in a crowded field of midsize sedans. As automakers strive to marry power with efficiency, the TSI engine represents a pivotal balance of innovative design and performance capabilities. Diving into the world of engine performance, specifications, and overall ownership experience reveals crucial insights that appeal to both savvy consumers and car enthusiasts alike.
Understanding the nuances of this engine requires more than a simple glance at the specifications sheet. It calls for a thorough exploration of how its engineering translates to real-world performance. From fuel efficiency figures that can save the wallet to the underlying technologies embedded in the design, thereโs much to unpack.
In this article, we will navigate multiple facets concerning the 2016 VW Passat TSI engine. Readers will gain insights that can help them make informed decisions, whether they're potential buyers seeking reliability or automotive aficionados analyzing technology. Letโs explore these themes in detail.
Performance and Specifications
Engine Specifications
The 2016 VW Passat is powered by a 1.8-liter turbocharged inline-4 TSI engine. This engine churns out 170 horsepower at about 6,200 RPM, which is on par for a midsize car. The torque figures are equally impressive, delivering up to 184 lb-ft from approximately 1,500 to 4,600 RPM. Such characteristics allow for a smooth and responsive driving experience, enhancing urban commutes and highway journeys alike.
Performance metrics suggest that the Passat's TSI engine merges practicality with a refreshing bolt of energy, making it tailored for diverse driving scenarios.
Equipped with a 6-speed automatic transmission, the engine provides easy gear transitions, ensuring a commendable driving experience without overwhelming the driver. This characteristic can be particularly appealing for those new to the automotive world or for those who prefer a less hands-on driving style.
Fuel Efficiency
Fuel efficiency is often a dealbreaker for buyers, and the 2016 Passat doesnโt disappoint. The TSI engine boasts 25 miles per gallon in the city and up to 38 on the highway, putting it ahead in the competition from a fuel economy perspective. Compared to many rivals, such as the Honda Accord or the Toyota Camry, the Passat's efficiency holds its own, providing savings that can accumulate significantly over time.
- City Economy: 25 mpg
- Highway Economy: 38 mpg
- Combined Efficiency: Approximately 31 mpg
These numbers indicate that whether youโre commuting daily or embarking on road trips, the Passat offers a reasonable return on investment at the gas pump.
Cost of Ownership
Initial Purchase Price
When considering the complete picture, the initial cost of the 2016 Passat plays a critical role. A brand-new unit during its release was priced starting around $22,000, which is relatively competitive within its segment. For those interested in used options, prices may fluctuate based on condition and mileage, but it remains a buyer-friendly price point in the midsize car market.
Maintenance Costs
Maintenance is another vital aspect that impacts the cost of ownership. The Passatโs reliability record helps mitigate potential issues, promoting peace of mind for owners. Routine maintenance generally includes oil changes, tire rotations, and the inevitable upkeep of filters and belts. On average, maintenance costs hover around $500-$700 annually, which is a reasonable figure in comparison to other sedans within its class.
Here are some common maintenance items:
- Oil changes
- Tire rotations
- Brake pad replacements
- Battery inspections
In summary, the 2016 VW Passat TSI engine serves as a remarkable option for those seeking a balance of performance and efficiency. As we delve deeper into other aspects of this engine, key technologies and innovations will come into focus, enriching the narrative even more. Ultimately, the TSI engine's presence resonates well within the automotive market, appealing to a broad array of buyers.
Prolusion to the VW Passat
The Volkswagen Passat has carved its niche as a staple in the automotive world, straddling the line between practicality and sophistication. Its design, while functional, carries an elegance that often goes unnoticed amid the hustle of competitors. This article will peel back the layers of the 2016 VW Passat, particularly its TSI engine, revealing both the mechanics and emotional appeal behind this vehicle.
Understanding the VW Passatโs significance is vital for anyone looking at compact sedans or contemplating reliability alongside performance. The TSI engine, in particular, represents a pivotal evolution in automotive engineering, showcasing how manufacturers can push boundaries to create more efficient and powerful engines without compromising performance or comfort. Letโs delve further into the historical backdrop of this vehicle and how itโs shaped to meet modern needs.
Historical Context
The legacy of the Passat stretches back to 1973, with Volkswagenโs vision of creating a vehicle that embodied both German engineering and consumer accessibility. Built on the foundation of reliability and efficiency, the Passat has continually adapted to shifting consumer demands and technological advances.
The 2016 model sits at the crossroads of modern engineering and traditional design philosophy. Perhaps, it is this blend of old and new that highlights VW's effort to maintain brand loyalty while attracting fresh eyes. The historical context serves not just as a backdrop but as a lens through which the quality of the Passat may be observed.
With the Passat, the story may seem straightforward, yet its journey through various generations mirrors the evolution of the sedan itselfโone that is interwoven with changes in design trends, environmental consciousness, and consumer preferences.
The Significance of the TSI Engine
The TSI, or Turbocharged Stratified Injection engine, stands out as a testament to Volkswagenโs commitment to innovation. When looking closely, the TSI engine marries power with efficiency in a way few other engines can, making it not just relevant but vital in todayโs market.


The technology behind TSI engines utilizes turbocharging and direct fuel injection, which optimize performance while reducing fuel consumption. It's a clever twist that pulls the best of both worlds: power on demand without sacrificing those hard-earned pennies at the pump. This engine technology offers drivers the zippy performance they crave, especially during acceleration or merging onto highways, while still being gentle on the environment.
Here are some notable features of the TSI engine:
- Turbocharged Performance: Provides a robust power band without the need for displacement-based power gains.
- Fuel Efficiency: Direct injection technology promotes a cleaner burn, yielding better miles per gallon compared to traditional engines.
- Smooth Handling: The engineโs lighter weight helps enhance the vehicleโs overall handling dynamics, giving it a nimble feel.
"The TSI engine reflects a critical step towards a more sustainable future in the automotive industry, proving that performance does not have to come at the expense of the planet."
Technical Specifications of the VW Passat TSI Engine
The technical specifications of the 2016 VW Passat TSI engine serve as the backbone for understanding its capabilities and the innovations that set it apart from competitors. Itโs not just about numbers; itโs about how these specifications translate into real-world performance, fuel efficiency, and overall driving experience. Diving into the specifics helps consumers, enthusiasts, and prospective buyers appreciate the engineering prowess that goes into every Passat TSI.
Engine Configuration
The engine configuration of the 2016 VW Passat TSI is a turbocharged inline-four setup, which offers an excellent balance between power and efficiency. By utilizing this layout, Volkswagen has managed to create an engine that produces a remarkable output while maintaining a compact size. In simple terms, this configuration allows for a lighter vehicle without sacrificing performance, giving the driver a zippy yet stable ride.
Unlike larger V6 or V8 engines, this four-cylinder design is inherently more efficient, often resulting in lower production costs and better fuel consumption. The turbocharger plays a key role here, as it helps the engine deliver that satisfying push in performance when accelerating. Consequently, drivers can experience robust acceleration while still enjoying the benefits of a fuel-efficient vehicle, ensuring they aren't left in a lurch at the pump.
Displacement and Cylinder Count
Displacement and cylinder count are crucial factors in any engine's operation. The 2016 VW Passat TSI engine features a displacement of 1.8 liters with four cylinders. This means that while the engine may not have the capacity of larger engines, it compensates with technology and turbocharging, maximizing what it can achieve.
The four-cylinder configuration helps in delivering 170 horsepower and 184 lb-ft of torque, figures that many competitors struggle to match in similar-sized engines. With a smaller engine, the Passat TSI can achieve power outputs traditionally expected from larger engines, giving the consumer both power and efficiency at a price that wonโt break the bank. This kind of technical sophistication illustrates why many today are opting for engines that prioritize smart design over sheer size.
Turbocharging Mechanisms
Turbocharging is a powerful technology that enhances engine performance without significantly adding weight. The 2016 VW Passat TSI utilizes a twin-scroll turbocharger, a notable advancement over traditional designs, enhancing responsiveness across various engine speeds.
Whatโs the advantage of a twin-scroll setup? It essentially helps to reduce turbo lag by ensuring that exhaust pulses are channeled effectively, creating pressure earlier in the power band. This means that when you hit the gas pedal, you donโt have to wait for the engine to catch up; it's right there with you, ready to deliver power instantly.
- Enhanced Fuel Efficiency: Turbocharging allows for smaller displacement engines to produce more power, making them more efficient.
- Reduced Emissions: With better combustion efficiency, engines emit fewer harmful substances into the atmosphere.
- Driving Experience: Drivers often feel smoother acceleration, making transitions less jerky, which is a notable plus for stop-and-go traffic.
In the context of the 2016 VW Passat TSI, turbocharging symbolizes a commitment to modern car design where the performance is not purely about engine size, but about intelligent engineering that adapts to the needs of todayโs drivers.
"The 2016 VW Passat TSI engine combines compact design with smart technology to deliver an experience that balances power and efficiency seamlessly."
In summary, understanding the technical specifications, from engine configuration to turbocharging, is crucial for anyone looking to appreciate the engineering marvel that the Passat TSI engine represents. This knowledge empowers consumers and enthusiasts by providing a roadmap to the performance and efficiency that await them behind the wheel.
Performance Metrics
Performance metrics provide invaluable insights into the capabilities and driving experience of the 2016 VW Passat TSI engine. Understanding these metrics allows potential buyers to ascertain how well the engine meets their needs, whether for daily commutes or spirited driving adventures. Key elements such as horsepower, torque, fuel efficiency, and handling characteristics all contribute to the overall perception of vehicle performance.
By analyzing performance metrics, one can gauge not only the raw power of the Passat TSI but also its efficiency and responsiveness. This deeper understanding aids automotive enthusiasts in making informed purchasing decisions while enabling current owners to appreciate the nuances of their vehicle. With environmental and tech-savvy consumers in mind, these metrics also reflect the balance between performance and fuel consumption, which is becoming a growing concern today.
Horsepower and Torque Ratings
The engine of the 2016 VW Passat TSI is powered by a 1.8-liter turbocharged inline-four, delivering an impressive horsepower rating of 170 hp at 4,500-6,200 rpm. The torque output is remarkable as well, reaching 184 lb-ft between 1,500-4,200 rpm. This combination of horsepower and torque means the Passat offers a responsive drive, ideal for both city and highway environments.
"With the right mix of power and efficiency, the TSI engine gives drivers a zing in their daily drive while keeping fuel costs reasonable."
This performance not only enables swift acceleration from a stop but also allows for confident passing maneuvers on the highway. The boost that a turbocharged engine provides ensures that drivers wonโt be left wanting while merging onto busy Interstate highways.
Fuel Efficiency Overview
Fuel efficiency is a critical factor for many buyers, particularly in todayโs climate-conscious market. The 2016 VW Passat TSI excels in this regard, with an EPA-estimated fuel economy rating of 25 mpg in the city and 38 mpg on the highway. This makes it a strong contender in the midsize sedan category, where fuel economy can significantly influence sales.
The combination of solid engineering and turbocharging technology means drivers can enjoy a more dynamic driving experience without sacrificing efficiency. When taking long road trips or simply driving around town, the Passat delivers commendable mileage, which translates to lower overall costs and a reduced carbon footprint.
Acceleration and Handling Features
The capability of an engine isnโt just measured in horsepower or fuel economy; the driving experience it provides plays a vital role as well. The 2016 VW Passat TSIโs engine contributes to a dynamic driving profile, offering smooth acceleration that integrates well with the vehicle's transmission.


When accelerating from a complete stop, the turbocharged engine allows drivers to hit 60 mph in about 7.3 seconds. This quick response can add a layer of excitement when navigating through urban environments or on twisty country roads.
Handling is another important element tied to performance metrics. The Passat boasts a well-tuned suspension system that grants it a sense of stability and composure, especially while cornering. Drivers will find that this blend of comfort and sportiness makes it a joy to drive.
In summary, performance metrics indicate that the 2016 VW Passat TSI engine delivers robust horsepower and torque ratings while balancing impressive fuel efficiency. It provides an engaging driving experience that appeals to a wide range of consumers, from everyday drivers to automotive aficionados.
Comparative Analysis with Competitors
When examining the Volkswagen Passat TSI engine, it's essential to contextualize its performance within the competitive automotive landscape. The comparative analysis with competitors not only sheds light on the strengths of the Passat but also highlights its weaknesses in relation to other models. This understanding helps potential buyers navigate their options and promotes informed decision-making among automotive enthusiasts.
Market Positioning
The market positioning of the 2016 VW Passat TSI is a testimony to its design and innovation. VW has strategically placed this model within the midsize sedan segment, where it competes with other notable vehicles, like the Honda Accord, Toyota Camry, and Ford Fusion. Each of these contenders brings its own flavor to the table.
- Volkswagen Passat TSI: Why did VW choose this path? The focus has been on delivering a blend of comfort, practicality, and efficiency. The TSI engine, known for its turbocharged capabilities, gives it an edge in providing an engaging driving experience.
- Honda Accord: Honda's reputation for reliability carries weight; it positions the Accord as a consistent top-seller, offering a spacious interior and good fuel economy.
- Toyota Camry: This car, known for its smooth ride and strong resale value, has a loyal following. Subaruโs reputation for longevity also plays a role here.
- Ford Fusion: The Fusion leans into sporty styling and offers hybrid options that appeal to increasingly eco-conscious buyers.
The VW Passat TSI holds its ground in this arena due to its unique engineering and emphasis on a premium feel; however, market trends indicate consumers are drawn to features over mere specifications.
Strengths and Weaknesses
Every vehicle has its strengths and weaknesses, and the 2016 VW Passat TSI is no exception. When pitting it against its rivals, several clear distinctions emerge.
Strengths:
- Turbo Efficiency: The TSI technology provides better power delivery while maintaining respectable fuel economy, often swaying buyers who favor both performance and efficiency.
- Interior Quality: The Passat features a more upscale interior compared to many competitors, making it a top choice for those who value luxury and comfort in daily commutes.
- Stable Driving Dynamics: Thanks to its handling and ride quality, it feels more planted on the road, appealing to those who enjoy spirited driving.
Weaknesses:
- Resale Value: Historically, VW models struggled with depreciation compared to Toyota or Honda, which can be a deterrent for some buyers.
- Rear Seat Space: While adequate, itโs not as spacious as that of the Accord or Camry, which may be a factor for those prioritizing family-oriented design.
Customer Satisfaction Compared
Customer satisfaction often mirrors the intangible aspects of a vehicle, colorfully painted by real-world experiences rather than just numbers and specs. When contrasting the VW Passat TSI with its rivals, the sentiment is varied.
"Most drivers appreciate the comfortable ride and luxurious feel of the Passat, although some wish for better mileage and more user-friendly tech."
- High Points: Enthusiasts often praise its turbocharged engineโs responsiveness and the finely crafted interior that adds to an elegant driving experience.
- Concerns: On the flip side, owners sometimes express frustration with the infotainment system, which can feel a bit outdated compared to competitors that are incorporating cutting-edge technology seamlessly.
Maintenance and Reliability Considerations
Understanding the maintenance and reliability considerations of the 2016 VW Passat TSI engine is crucial for owners and enthusiasts alike. This section will delve into essential elements like routine upkeep, frequent issues that may arise, and insights on long-term durability. By maintaining awareness of these factors, vehicle owners can ensure their cars operate smoothly for years to come, preserving their investment.
Routine Maintenance Requirements
Proper routine maintenance acts as the backbone of longevity for the TSI engine. Owners should keep a systematic schedule, including regular checks and services. Here are some vital maintenance necessities:
- Oil Changes: Regular oil changes are necessary to keep the engine well-lubricated and functioning optimally. It is advisable to change the oil every 5,000 to 7,500 miles, depending on the type used. Synthetic oil often comes highly recommended due to its superior performance and longevity.
- Filter Replacements: This includes air filters and oil filters that should be periodically replaced. Clean filters improve efficiency and help the engine breathe better.
- Spark Plug Changes: Spark plugs need to be checked and, if necessary, replaced approximately every 40,000 miles to ensure smooth ignition.
- Fluid Checks: Regular inspections of coolant, brake fluid, and transmission fluid levels are essential to prevent unexpected failures.
Staying ahead of these maintenance requirements not only aids performance but also boosts reliability.
Common Issues and Solutions
While the TSI engine is generally a solid performer, like any machinery, it is not immune to certain issues. Here are some prevalent problems along with practical solutions:
- Fuel Injector Issues: Some drivers report minor hiccups that can often be traced back to dirty or faulty fuel injectors. Using a quality fuel system cleaner or having them professionally cleaned can often rectify this issue.
- Thermostat Failures: A failing thermostat can lead to overheating or suboptimal engine performance. Regular cooling system checks can identify potential problems early, saving costly repairs.
- Boost Leak: Due to the turbocharging setup, boost leaks can lead to reduced performance. Regular inspection of the vacuum lines can help you catch leaks before they escalate.
- Electrical Glitches: Electronic components can sometimes falter. If experiencing erratic behaviors like warning lights, a thorough diagnostic check is advisable to isolate the issue.
Being proactive about these common issues can save time and money, ensuring the TSI engine remains dependable.
Long-term Durability Insights
When discussing long-term durability, the 2016 VW Passat TSI engine often reveals promising insights. Owners frequently report:


- Strong Resale Value: Vehicles that receive consistent maintenance tend to retain value better over time. A well-kept Passat can attract better offers in the market.
- Longevity: With proper care, many TSI engines can still perform reliably upwards of 150,000 miles or more. Routine maintenance plays a crucial role in achieving this milestone.
- Adaptability: This engine is designed to handle a variety of driving conditions, making it suitable for both city streets and highways.
"Consistency in maintenance not only enhances performance but also ensures that any potential issues donโt snowball into larger problems."
In summation, focusing on these maintenance and reliability considerations will educate owners on how to sustain their 2016 VW Passat TSI. By adhering to recommended practices and remaining vigilant about common issues, they can enjoy a vehicle that performs well and requires minimal unexpected repairs.
Market Trends Influencing the VW Passat
Understanding market trends is vital in grasping how the 2016 VW Passat, especially its TSI engine variant, fits into the automotive tapestry of its time. Market dynamics shape everything from sales strategies to design choices and regulatory adaptations.
Economic Factors Impacting Sales
The economic landscape plays a crucial role in car sales. Factors such as inflation, interest rates, and overall economic growth can directly influence consumer purchasing power. For the 2016 VW Passat, the scenarios were mixed.
- Interest Rates: Low interest rates encouraged buyers to finance their vehicles, often leading to an uptick in sales. With the economy rebounding post-2008 financial crisis, many consumers felt more comfortable investing in mid-range sedans like the Passat.
- Fuel Prices: The fluctuations in fuel prices impact consumer choices considerably. In 2016, when fuel prices dipped, many buyers leaned towards more powerful options, including the TSI engine, which offered robust performance without sacrificing efficiency.
- Economic Sentiment: A general feeling of optimism about the future economy can impact whether consumers choose to purchase a new vehicle. Reports suggested that 2016 saw consumer confidence rise, providing a fortuitous backdrop for VW Passat sales.
Considering these aspects, it is clear that economic conditions around 2016 significantly influenced the VW Passat TSIโs market presence.
Consumer Preferences in Automotive Design
Shifts in consumer preferences have reshaped automotive designs, compelling manufacturers to adapt and innovate. The 2016 Passat needs to be examined through this lens of consumer tendencies that dictate market demands.
- Shift Towards Sedans: While SUVs were gaining traction across the market, sedans like the Passat still held their ground due to their manageable size and fuel efficiency. The interior space and comfort of the Passat made it appealing for families and individuals alike.
- Tech Integration: Buyers were increasingly favoring vehicles equipped with modern technology. The Passat met this demand through user-friendly infotainment systems, advanced safety features, and the inclusion of driver-assistance technologies that made driving a smoother experience.
- Eco-Friendliness: Awareness regarding environmental issues has prompted consumers to seek out more efficient engines. The TSI engineโs balance of power and fuel economy made it a favorable choice for buyers looking to minimize their ecological footprint while not compromising on driving pleasure.
These consumer preferences highlight the necessity for manufacturers like VW to continuously evolve their offerings to remain competitive in the busy automotive market.
Regulatory Impacts on Engine Development
The 2016 model of the VW Passat also had to navigate a wave of regulatory changes that were affecting the automotive sector. Emission standards and fuel economy regulations had a significant say in engine choices and configurations.
- Emissions Regulations: The automotive industry saw stricter regulations concerning emissions starting from the late 2010s. The TSI engine was developed in consideration of these standards, which led to innovations in both turbocharging and fuel delivery systems to produce lower emissions without sacrificing performance.
- Fuel Economy Standards: Governments worldwide were imposing tighter fuel economy regulations, pushing brands to maximize efficiency. The 2016 VW Passat TSI engine was not unscathed from this pressure; its efficiency ratings were meant to meet or even exceed these benchmarks, making it an attractive option for a savvy consumer base.
- Global Market Considerations: VW had to take into account not only regional regulations but also global policies, as the Passat was marketed in diverse markets. The need to balance design and engine efficiency while adhering to regulations across the board made development for the TSI engine a complex yet vital factor.
The interplay of these regulatory pressures has also highlighted the importance of forward-thinking in engine design and compliance, shaping how the VW Passat has been perceived and positioned in the market.
Successful automotive companies ensure their designs tick all boxes: consumer demands, regulatory requirements, and market trends.
Closure and Future Outlook
The conclusion serves as the linchpin of understanding the VW Passat TSI engine, tying together both the past and future of this automotive marvel. It encapsulates the insights gleaned throughout the earlier sections while casting an eye forward at what car enthusiasts and buyers can expect from future models. By examining the TSI engineโs strengths, market trends, and maintenance considerations, we gain a holistic understanding of its relevance in todayโs automotive market.
Summary of Findings
In summary, the 2016 VW Passat TSI engine showcases innovation in design, combining efficiency with performance. Key findings include:
- Engine Configuration: Using a four-cylinder layout, the TSI engine provides a compact yet powerful solution for modern driving needs.
- Fuel Efficiency: Improved fuel economy without compromising on power stands out as a significant advantage, appealing to both eco-conscious drivers and performance aficionados alike.
- Customer Satisfaction: Reviews indicate that reliability and driving comfort rank high among owner priorities, positioning the Passat favorably against competitors.
These elements contribute to a comprehensive understanding of how the TSI engine fits into the broader context of vehicle design and consumer expectations.
Predictions for Future Models
Looking ahead, the trajectory for future VW Passat models is both exciting and complex. As manufacturers delve into greener technologies, we can anticipate innovations that further embrace hybrid or fully electric options. The TSI engine may evolve to incorporate more advanced turbocharging systems that enhance both performance and emissions control. Potential changes include:
- Expanded Hybridization: Considering the ongoing trend toward sustainability, VW may integrate hybrid options, blending traditional power with electric efficiency.
- Enhanced Turbocharging: Future iterations could feature more sophisticated turbo technology, improving power delivery across a wider range of driving conditions.
- Increased Connectivity: Upcoming models are likely to incorporate advanced infotainment systems that connect drivers more seamlessly with their digital environments.
"As consumer preferences shift toward sustainability and technology, the evolution of the TSI engine reflects the landscape of modern automotive demands."
Importance of References in This Article
- Establishing Credibility
References from respected automotive publications or technical manuals bolster the articleโs authority. This credibility becomes vital especially when discussing areas like performance metrics, customer satisfaction, or maintenance concerns. Most readers value data and insights drawn from recognizable names in the industry. - Resource for Further Inquiry
Providing a list of references not only aids in establishing authority but also serves as a valuable resource for the curious reader. If someone finds a particular aspect intriguing, they can explore linked studies or articles for more in-depth understanding. This enriched knowledge contributes to an informed audience, which is beneficial for the automotive community. - Supporting Claims and Data
Facts and figures, particularly regarding horsepower ratings or fuel efficiency, often need to be backed by research or testing metrics. References will validate various claims made throughout the discussion. When a reader looks at the performance metrics, having data from vehicles tested under the same conditions adds weight to those pieces of information.
"References not only add credibility but also invite the audience to engage deeper in their learning journey."
Key Considerations Regarding References
- Accuracy and Relevance: The references used must be accurate and pertinent to the specific details associated with the VW Passat TSI engine. Outdated or unrelated sources can confuse or mislead readers.
- Diversity of Sources: Utilizing a variety of referencesโfrom academic journals to industry reports and consumer feedbackโenriches the content. This triangulation of information helps provide a broader perspective on the vehicleโs capabilities and overall impact in the market.
- Timeliness: In a field as rapidly evolving as automotive technology, ensuring that references are current is vital. This is particularly pressing for discussions about environmental regulations and technological advancements related to the TSI engine.
In essence, well-chosen references weave a tapestry of reliable knowledge. They serve as the backbone of this article, paving the way for a nuanced understanding of the 2016 VW Passat TSI engine and its place within the automotive realm.