Maintaining the 2016 Subaru Legacy with the correct lubricants is essential for preserving the integrity of its FB25 2.5L four-cylinder engine. This boxer engine design requires specific attention to oil viscosity and filtration to ensure longevity, especially given Subaru’s reputation for reliability under diverse driving conditions. Using the right fluids helps manage the engine’s operating temperature, reduces wear on internal components, and ensures that the all-wheel-drive system functions smoothly. Whether you are driving through harsh winter roads or tackling long highway commutes, the performance of your fluids directly correlates to the vehicle’s overall health and efficiency.
Recommended AMSOIL Products
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – Provides maximum protection with up to 25,000 miles of coverage and superior resistance to horsepower loss.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – Offers an extended service interval of 20,000 miles with enhanced cleaning power to keep the engine running smoothly.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – Delivers reliable protection at a value price, effectively fighting sludge and deposits.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – Formulated specifically for engines with over 75,000 miles to reduce sludge and consumption.
- AMSOIL Oil Filter – Delivers 99% filtration efficiency at 20 microns and allows lower restriction to keep engine parts lubricated.
- WIX Oil Filter – A high-quality aftermarket option featuring premium media that improves upon original equipment specifications.
The 2016 Subaru Legacy’s engine bay is designed for precision, and this includes the oil capacity requirements. The 2.5L FB25 engine holds 5.1 quarts of oil when the filter is replaced. After pouring the new fluid, it is critical to refill check the oil level to ensure it sits within the optimal operating range on the dipstick. The drain plug should be torqued to 31 ft/lbs, and a new washer must be installed on the bolt to prevent leaks. Notably, synthetic oil is required for this application, making the AMSOIL options an ideal choice for meeting these specifications while exceeding standard performance expectations.
Transmission and Drivetrain Protection
The Subaru Legacy is renowned for its all-wheel-drive system, which relies heavily on specialized fluid to operate the CVT (Continuously Variable Transmission). For the 2016 model with the FB25 engine, the automatic transmission fluid is critical for maintaining the frictional properties necessary for smooth power delivery. The total fill capacity for the TR580 transmission is approximately 12 quarts. Using a synthetic CVT fluid ensures that the transmission is protected against wear and temperature extremes, providing exceptional metal-to-metal frictional properties that help the vehicle run efficiently.
For the differential, the rear axle requires a specific GL-5 lubricant. Depending on the temperature and the specific application of the vehicle, the rear differential holds 1.7 pints of fluid. AMSOIL offers a range of SEVERE GEAR 80W-90 100% Synthetic Gear Lube suitable for this application. The 80W-90 formulation is excellent for general use, providing advanced protection against wear and controlling thermal runaway. Alternatively, the SEVERE GEAR 75W-90 100% Synthetic Gear Lube and SEVERE GEAR 75W-110 100% Synthetic Gear Lube offer superior protection across a wider range of temperatures and are ideal for those who tow or operate under severe service conditions. These fluids contain friction modifiers for limited-slip applications, ensuring longevity for seals and equipment.
Cooling System and Brake Fluid
Keeping the engine at the proper temperature is vital for preventing overheating and corrosion. The 2016 Legacy’s cooling system has a capacity of 8.2 quarts. AMSOIL offers the AMSOIL Passenger Car & Light Truck Antifreeze & Coolant, a unique poly-organic acid (OAT) formulation that protects all cooling system metals, gaskets, and hoses. It is compatible with all other coolant colors and free of phosphates, nitrates, and other harsh chemicals. For those who prefer a concentrated option, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant provides protection up to 150,000 miles or 5 years, requiring mixing with distilled or high-quality water for optimal performance.
Braking safety cannot be compromised. The 2016 Legacy utilizes a DOT 3 hydraulic brake fluid system. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is recommended to ensure excellent ABS and traction-control responsiveness. It provides a stable viscosity over a wide temperature range, which is crucial for maintaining braking performance during emergency stops or in extreme weather conditions. Using a synthetic brake fluid helps prevent moisture absorption, which can lead to boiling and brake failure over time.
Filters and Maintenance
Filtration plays a dual role in keeping the engine clean and the air supply free of contaminants. Alongside the oil filters mentioned earlier, the AMSOIL fitment guide recommends the WIX Air Filter for the 2016 Subaru Legacy. This filter uses premium media to capture dust and debris, ensuring that the engine breathes clean air and operates at peak efficiency. Proper airflow is essential for the FB25 engine’s performance, and a clogged filter can restrict air intake, leading to reduced power and fuel economy.
Additional Care Products
For owners looking to extend the life of their vehicle during storage or to enhance performance, AMSOIL offers several specialized products. The AMSOIL P.i.® Performance Improver Gasoline Additive is highly effective for restoring up to 14% horsepower and cleaning fuel injectors, which is beneficial for GDI engines. For seasonal storage, the AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, while the AMSOIL Engine Fogging Oil protects internal components from rust during long periods of inactivity. These additives ensure that whether the car is being driven daily or sitting for the winter, the internal systems remain protected and ready for action.
About the Vehicle
The 2016 Subaru Legacy represents a solid entry in the midsize sedan market, known for its balanced handling and practical all-wheel-drive capabilities. Based on the Subaru Global Platform architecture, this model year offers a refined driving experience that blends comfort with a sporty character. The standard 2.5L FB25 four-cylinder engine is celebrated for its reliability and fuel efficiency, making it a favorite for families and commuters alike. It delivers adequate power for everyday tasks while maintaining a reputation for long-term durability when properly maintained.
Subaru’s symmetrical all-wheel-drive system is a key feature of the Legacy, providing superior traction in various weather conditions. This system sends power to all four wheels, enhancing stability on wet, snowy, or uneven roads. The interior of the 2016 Legacy is designed with the driver in mind, offering a comfortable cabin with intuitive controls and ample space for passengers and cargo. The combination of a spacious interior, efficient engine options, and robust safety features has made the Legacy a staple in the Subaru lineup, appealing to drivers who value safety, versatility, and reliability. Whether navigating city streets or embarking on a cross-country road trip, the Legacy delivers a sense of confidence and control that keeps drivers returning to the brand.