Maintaining your 2016 Subaru Impreza with a 2.0L FB20 engine requires precise attention to fluid specifications. Subaru vehicles, particularly those with naturally aspirated Boxer engines, rely on specific oil viscosities to ensure proper lubrication between the horizontally opposed pistons. The engine code FB20 is designed to operate efficiently on low-viscosity oils that can withstand the thermal stress of the engine’s unique layout. Using the correct fluid ensures optimal performance, prevents premature wear, and maintains the vehicle’s fuel economy. The factory recommends a 0W-20 viscosity grade, which is critical for both cold starts and high-temperature stability. Beyond the engine, the transmission and differential systems also have specific fluid requirements that, if met with high-quality synthetic alternatives, can significantly extend the service life of these components.
Recommended AMSOIL Products
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – The ultimate choice for maximum engine protection, offering up to 25,000 miles of protection and superior performance in extreme temperatures.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – An ideal option for drivers seeking extended service intervals of up to 20,000 miles while maintaining excellent engine cleanliness.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – Designed to outperform conventional oils and mimic the performance characteristics of original equipment manufacturer fluids.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – A specialized formula for engines with over 75,000 miles, featuring enhanced detergents to reduce sludge and improve seal conditioning.
- AMSOIL Oil Filter – Features a filtration efficiency of 99 percent at 20 microns to capture small, wear-causing contaminants and reduce engine wear.
- WIX Oil Filter – A premium aftermarket option that offers improved filtration over original equipment manufacturer filters.
- AMSOIL 100% Synthetic CVT Fluid – Provides exceptional metal-to-metal frictional properties for automatic transmissions, ensuring smooth shifting and reduced wear.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 pre-mixed formulation that protects the cooling system for up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that greatly surpasses standards for metallic corrosion and erosion protection in passenger cars.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Recommended for manual transmissions and front differentials, offering advanced protection against wear and thermal runaway.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent ABS and traction-control responsiveness with a stable viscosity across a wide temperature range.
The engine in your 2016 Impreza is a 2.0L 4-cylinder, often referred to by the engine code FB20. This engine requires a total capacity of 5.1 quarts when the oil filter is included. After refilling, it is crucial to check the oil level to ensure it is within the safe operating range. The oil drain plug should be torqued to 31 ft/lbs, and a new washer must be installed on the drain bolt to prevent leaks. Synthetic oil is required for this engine to function as intended. The 5.1-quart capacity is a specific requirement for the FB20 engine code, and adhering to this amount ensures the oil pump can circulate fluid effectively throughout the horizontally opposed cylinder configuration.
Choosing the right oil is not just about filling a gap; it is about protecting the internal components of the FB20 engine. The AMSOIL Signature Series offers the highest level of protection, with testing showing it provides 75% more engine protection against horsepower loss and wear compared to conventional oils. For those extending their service intervals, the Signature Series can last up to 25,000 miles or one year, whichever comes first, without losing its protective properties. The Extended-Life 0W-20 offers a robust alternative with up to 20,000 miles of protection, featuring 37% more cleaning power to help keep the engine running smoother and longer. The OE 0W-20 is an excellent choice for drivers who want to outperform conventional oils while staying true to original equipment mileage recommendations. For vehicles that have surpassed 75,000 miles, the High-Mileage 0W-20 is specifically formulated with boosted detergents and dispersants to clean sludge and reduce the risk of oil leaks by conditioning seals.
Transmission and Drivetrain Fluids
Subaru’s all-wheel-drive system and transmission require specific fluid types to maintain performance. For the automatic transmission, specifically the TR580 model found in the CVT, the total fill capacity is 12.9 quarts. The AMSOIL 100% Synthetic CVT Fluid is designed to provide exceptional metal-to-metal frictional properties, which are essential for the smooth operation of a CVT transmission. This fluid helps manage the high thermal loads generated during normal driving and extreme conditions.
For manual transmissions, such as the TY758 model, a 75W-90 gear lube is recommended. The capacity for a manual transmission is 7.4 pints. When performing a manual transmission fluid change, the drain plug torque specifications are critical: 33 ft/lbs for the first instance, and 52 ft/lbs for subsequent instances, with a new washer required each time. The AMSOIL SEVERE GEAR 75W-90 is ideal for this application, offering advanced protection against wear and controlling thermal runaway. It also contains friction modifiers specifically for limited-slip applications, ensuring that the differential performs correctly under load.
Differential and Axle Lubrication
The front final drive is designed for automatic transmissions only and requires a GL-5 rated lubricant. The capacity for the front differential is 2.5 pints. For the rear differential, the GL-5 capacity is 1.7 pints. Depending on the ambient temperature and usage, different viscosity grades may be appropriate. For temperatures above 0 degrees Fahrenheit, a 90-weight gear lube is suitable, while for all temperatures, a 75W-90 is recommended. The AMSOIL SEVERE GEAR 75W-90 and 75W-110 are top-tier choices for these differentials. The 75W-110 variant is particularly effective in heavy-duty applications where higher viscosity is beneficial. Both fluids help reduce operating temperatures, protect against rust and corrosion, and extend the life of seals and equipment.
Cooling System Maintenance
Maintaining the cooling system is vital for the longevity of the 2.0L FB20 engine. The coolant capacity varies depending on the transmission type. For vehicles equipped with the CVT, the system holds 8.9 quarts, while those with a manual transmission hold 8.5 quarts. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a 50/50 pre-mix formulation that protects all cooling system metals, gaskets, and hoses. It is phosphate, nitrate, nitrite, silicate, borate, and amine-free, making it compatible with all other antifreeze colors and safe for long-life use. For those who prefer a concentrated option, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers protection up to 150,000 miles or 5 years, requiring mixing with distilled or high-quality water.
Brake Fluid and Seasonal Care
The braking system on the 2016 Impreza is sensitive to fluid quality. The recommended fluid for the HB brake system is FMVSS116 DOT-3 or DOT-4. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides excellent ABS and traction-control responsiveness. Its stable viscosity over a wide temperature range ensures consistent braking performance, which is critical for the safety of the vehicle. In addition to mechanical fluids, seasonal storage products can help protect the vehicle when it is not in use. AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish and gum buildup, while AMSOIL Engine Fogging Oil is a highly-effective rust preventive designed to protect internal engine components during long periods of inactivity.
About the Vehicle
The 2016 Subaru Impreza represents a staple in the compact car market, renowned for its all-wheel-drive capability and reliability. This model year features the 2.0L FB-series engine, a significant evolution from the earlier EJ20 engine, designed to offer improved fuel efficiency and reduced emissions without sacrificing power. The FB20 engine is known for its horizontally opposed “Boxer” configuration, which lowers the vehicle’s center of gravity, enhancing handling and stability—a hallmark of Subaru’s engineering philosophy.
Owners of the 2016 Impreza often appreciate the vehicle’s practicality and safety features. The all-wheel-drive system provides confidence in various weather conditions, making it a popular choice in regions with snow and rain. The sedan body style offers a comfortable ride for daily commuting, while the hatchback variant appeals to those needing extra cargo space. The 2.0L engine typically produces around 152 horsepower, which, while not aggressive, provides sufficient power for everyday driving scenarios and is paired with either a continuously variable transmission (CVT) or a 5-speed manual gearbox, giving drivers a choice between smooth automatic operation or a more engaging manual experience.
The Impreza has established a strong reputation for longevity and durability, often serving as a family vehicle for many years. Its compact dimensions make it easy to maneuver in urban environments, yet it retains enough interior room for passengers. The 2016 model year continues to be a favorite among enthusiasts who value the unique driving characteristics of a Boxer engine coupled with Subaru’s symmetrical all-wheel-drive system. Proper maintenance, including the use of high-quality synthetic lubricants as recommended, ensures that this vehicle continues to perform reliably for its owners, regardless of the miles on the odometer.
Additional Products for Vehicle Care
For drivers looking to optimize their vehicle’s fuel system and performance, AMSOIL P.i.® Performance Improver Gasoline Additive is a valuable addition. This additive restores up to 14% horsepower and brings GDI fuel injectors back to 100% flow rate after just one tank of fuel treated. It helps improve fuel economy and reduces the need for higher-octane fuel. Additionally, the AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor lubricates the fuel system and upper cylinders, compatible with capless fuel systems.
For general vehicle maintenance and cleaning, a range of products is available. AMSOIL Synthetic Multi-Purpose Grease resists thermal and oxidation degradation, making it ideal for chassis lubrication. AMSOIL Heavy-Duty Metal Protector provides a long-lasting, protective coating against rust and corrosion, perfect for steel, iron, and aluminum surfaces exposed to salt and moisture. For cleaning and detailing, AMSOIL Brake and Parts Cleaner quickly removes oil and grease from brake parts without leaving residue, while the AMSOIL Power Foam® Carburetor and Induction-System Cleaner removes deposits from ethanol and degraded fuel, maximizing horsepower and restoring startability.
The 2016 Subaru Impreza is a vehicle that rewards diligent care. By using the recommended AMSOIL fluids and lubricants, owners can ensure that their vehicle remains in peak condition. From the engine oil and filters to the transmission fluid and gear lube, every component benefits from the advanced technology found in these synthetic products. Whether you are driving in extreme cold, towing, or simply commuting to work, these fluids provide the protection necessary to keep your Impreza running smoothly for the long haul.