Maintaining the 2022 Subaru Forester equipped with the 2.5L 4-cylinder FB25D engine requires precise fluid choices to ensure reliability, fuel efficiency, and long-term durability. Subaru’s Boxer engine design, combined with the vehicle’s all-wheel-drive system, places specific demands on the lubrication system, particularly regarding friction modifiers for the continuously variable transmission (CVT) and extreme pressure protection for the differentials. Using factory-specification fluids or high-quality aftermarket alternatives is essential to prevent premature wear on the CVT, manage operating temperatures, and protect against sludge buildup in the engine. The following guide details the specific AMSOIL lubrication recommendations for this model, covering engine oil, transmission fluid, coolants, and other critical maintenance products.
Recommended AMSOIL Products
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – Provides unsurpassed engine protection for up to 25,000 miles and offers superior wear resistance against horsepower loss, making it the top choice for drivers seeking maximum longevity and performance.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – Delivers extended protection for up to 20,000 miles with 37% more cleaning power to keep the engine running smoother and help prevent low-speed pre-ignition events.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – An excellent OEM mileage option that fights sludge and deposits with a 100% synthetic formulation, offering a cost-effective solution that meets high industry standards without the premium price tag.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles, featuring enhanced detergents and anti-wear additives to reduce sludge by 67% and support better engine performance in older engines.
- AMSOIL Oil Filter – Engineered for extended service life with 99% filtering efficiency at 20 microns, this filter provides greater capacity for contaminants and lower restriction to keep engine parts lubricated longer.
- WIX Oil Filter – A premium aftermarket filter with media that offers improvements over original equipment manufacturer-branded filters, providing reliable filtration for those preferring a traditional brand pairing.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A ready-to-use 50/50 ethylene glycol pre-mix that protects all cooling system metals, gaskets, and hoses for up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated, environmentally friendly coolant option that greatly surpasses standards for metallic corrosion and erosion, ideal for those seeking a high-performance, non-toxic solution.
- AMSOIL 100% Synthetic CVT Fluid – Provides exceptional metal-to-metal frictional properties specifically designed for Subaru’s CVT systems to ensure smooth operation and protection against wear in severe driving conditions.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Offers advanced protection for the rear differential with friction modifiers for limited-slip applications, controlling thermal runaway and reducing operating temperatures.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range, ensuring consistent braking performance in all weather conditions.
The engine oil capacity for the 2022 Subaru Forester 2.5L with a filter installed is 4.4 quarts. It is critical to ensure the oil drain plug is torqued to the correct specification of 31 ft/lbs and that a new washer is installed on the drain bolt to prevent leaks. While the factory recommendation specifies 0W-20 synthetic, in a pinch where 0W-20 synthetic is unavailable, 5W-30 conventional oil may be used for replenishment, though it should be changed back to 0W-20 synthetic at the next scheduled service.
For the cooling system, the Forester requires 9 quarts of coolant. Owners can choose between the ready-to-use AMSOIL Passenger Car & Light Truck Antifreeze & Coolant or the concentrated AMSOIL Propylene Glycol Antifreeze and Engine Coolant, depending on their preference for pre-mixed convenience or long-term storage and mixing capabilities. The automatic transmission, specifically the TR580 type, has distinct capacity requirements. For the standard Forester models, the total fill capacity is 12.7 quarts, while the Wilderness edition requires 12.4 quarts. Subaru specifies VTF23 fluid for standard models and VTF24 for the Wilderness trim. The AMSOIL 100% Synthetic CVT Fluid is recommended for these applications, as it is engineered to handle the friction demands of the CVT pulley system, which are critical for the vehicle’s acceleration and fuel economy.
The rear differential requires GL-5 lubricant and has a capacity of 1.7 pints. AMSOIL offers three distinct synthetic gear lubes that are suitable for this application: SEVERE GEAR 75W-90, SEVERE GEAR 75W-110, and SEVERE GEAR 80W-90. These formulations contain friction modifiers essential for limited-slip differentials, help control thermal runaway, and reduce operating temperatures to extend the life of the seals and gears. For brake maintenance, the vehicle utilizes fluid meeting FMVSS116 DOT-3 or DOT-4 specifications. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is the ideal replacement, offering superior wet boiling points and consistent performance to maintain safety and pedal feel.
Maintenance Tips and System Protection
Regular maintenance intervals can be significantly extended when using AMSOIL synthetic products, provided the vehicle operates under normal service conditions. The Signature Series motor oil is tested to guarantee up to 25,000 miles of protection, while the Extended-Life variant supports up to 20,000 miles. For high-mileage vehicles over 75,000 miles, the High-Mileage formula helps reduce oil consumption and seals leaks, extending the engine’s operational life. The oil filters, whether the AMSOIL Oil Filter EA15K13-EA or the WIX Oil Filter 57055-EA, are designed to capture microscopic contaminants that standard filters miss, ensuring the engine stays clean even during extended drain intervals.
In addition to fluids, fuel system health is paramount for the FB25D engine. Carbon buildup can occur over time, particularly in vehicles that see short trips or are driven in stop-and-go traffic. AMSOIL P.i.® Performance Improver is recommended to restore up to 14% horsepower and clean GDI fuel injectors to 100% flow rate, ensuring optimal combustion and fuel economy. During seasonal storage, AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, while AMSOIL Engine Fogging Oil protects internal components from rust and corrosion. These additives, combined with the synthetic lubricants, create a comprehensive protection system that keeps the 2022 Forester running like new.
Vehicle Background
The 2022 Subaru Forester represents the fifth generation of this popular compact crossover SUV, continuing a legacy of reliability that dates back to 1997. Renowned for its standard Symmetrical All-Wheel Drive system, the Forester has long been a favorite among outdoor enthusiasts and drivers living in regions with harsh weather. The 2022 model retains the boxy, practical design that prioritizes visibility and utility, making it a top choice for families and adventurers alike. The vehicle is powered by a naturally aspirated 2.5-liter four-cylinder Boxer engine, producing roughly 182 horsepower, paired with a Lineartronic continuously variable transmission (CVT). This combination delivers smooth acceleration and excellent fuel efficiency, with EPA estimates reaching up to 26 miles per gallon in the city and 32 on the highway for the standard trim.
One of the Forester’s most distinct features is its commanding driving position. With a roofline that sits higher than most competitors and available 8.7 inches of ground clearance, the vehicle offers a commanding view of the road, which enhances safety and confidence. The cabin is designed for maximum versatility, featuring a flat-load floor when the 60/40 split-folding rear seats are reclined, transforming the cargo area into a spacious hauling zone. This utility, combined with the standard All-Weather Package on higher trims, makes it a versatile tool for everything from daily commuting to off-road exploration. The platform is built on Subaru’s global compact architecture, which contributes to a rigid body structure and a low center of gravity, improving handling dynamics despite the vehicle’s height.
While the 2022 Forester is highly regarded for its durability, owners should be aware of several common issues that can be mitigated with high-quality synthetic lubricants. One prevalent concern is the sensitivity of the CVT to fluid degradation. Over time, the fluid can lose its friction modifiers, leading to shuddering or “rubber banding” sensations during acceleration. Using a high-performance synthetic CVT fluid like AMSOIL 100% Synthetic CVT Fluid can help restore proper friction characteristics and extend the service life of the transmission. Another issue involves engine oil consumption, particularly in early FB-series engines where piston ring design led to higher than normal oil usage. While later iterations saw improvements, the high-mileage variants of AMSOIL motor oil, such as the 0W-20 High-Mileage formula, can help reduce this consumption and minimize smoke.
Carbon buildup on intake valves is another potential issue for direct injection engines like the FB25D, which can lead to rough idling and reduced power. Regular use of fuel system cleaners like AMSOIL P.i.® can prevent this accumulation. Additionally, the vehicle’s all-wheel-drive system places significant stress on the rear differential and transfer case, especially during winter driving or off-road use. The synthetic gear lubes recommended for this vehicle provide superior thermal stability, preventing the oil from thinning out under heavy loads and ensuring the differentials continue to operate smoothly even in extreme temperatures. By addressing these specific maintenance areas with the correct fluids, owners can maximize the longevity and performance of their Subaru Forester.