The 2009 Subaru Forester equipped with the 2.5-liter naturally aspirated EJ253 engine requires specific lubricants to maintain reliability and performance. This vehicle’s engine is known for its flat-four configuration, which necessitates fluids that can handle consistent thermal loads and provide adequate protection against wear, especially in colder climates. Using the correct viscosity grade and high-quality synthetic formulations can significantly extend the service life of your powertrain components while maintaining fuel efficiency. Whether you drive in stop-and-go city traffic, on winding mountain roads, or under heavy snow, your vehicle’s lubrication system needs to remain robust.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Delivers the highest level of protection with a guaranteed service interval of up to 25,000 miles, offering exceptional resistance to viscosity breakdown and wear.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – An economical yet high-performance option providing 37% more cleaning power and a guaranteed service interval of 20,000 miles.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – Formulated to outperform conventional oils while meeting OEM specifications, offering excellent sludge prevention.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Ideally suited for vehicles with over 75,000 miles, featuring enhanced additives to reduce sludge and oil consumption.
- AMSOIL Oil Filter EA15K12 – Provides 99% filtration efficiency at 20 microns, ensuring superior contaminant capture and reduced engine wear.
- WIX Oil Filter 57712 – A premium aftermarket option featuring high-quality media for effective engine protection.
- WIX Air Filter 46914 – Ensures clean airflow to the engine, improving efficiency and protection against particulate ingestion.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed, phosphate-free formulation that protects against corrosion and freezing up to 150,000 miles.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Engineered to withstand heavy towing and elevated temperatures while maintaining fluidity in sub-zero conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Promotes smooth shifts and resists harmful sludge formation for extended transmission life.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Advanced protection against wear and thermal runaway for manual transmissions and differentials.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Provides superior protection for limited-slip applications and reduces operating temperatures.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – Ideal for demanding conditions requiring a heavier viscosity for maximum load support.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Offers stable viscosity over a wide temperature range for superior ABS and traction-control responsiveness.
- AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube – Specifically engineered for extended service life in over-the-road and high-demand applications.
- AMSOIL Gasoline Stabilizer – Keeps fuel fresh for up to 12 months, ideal for seasonal storage.
- AMSOIL P.i.® Performance Improver – Restores up to 14% horsepower and improves fuel economy by cleaning injectors.
Maintaining the proper fluid levels and using the correct specifications is crucial for the longevity of the 2009 Subaru Forester’s 2.5L EJ253 engine. The engine oil capacity for a change, including the filter replacement, is 4.4 quarts. The preferred viscosity for all temperature ranges is SAE 5W-30, which ensures optimal flow during cold starts while maintaining a protective film at operating temperatures. The oil drain plug requires a torque of 33 ft/lbs during reassembly. It is important to refill the oil to the correct level and check the oil level after the refill to ensure the crankcase is not overfilled or underfilled.
Protection for Engine and Filters
AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil stands out as the top choice for owners seeking maximum performance. This oil offers 75% more engine protection against horsepower loss and wear compared to standard oils. It is trusted by professional engine builders and provides a guaranteed service interval of up to 25,000 miles or one year. For those looking for a balance between cost and performance, AMSOIL Extended-Life provides 37% more cleaning power to keep the engine running smoother for longer. This option is excellent for preventing sludge buildup and offers a guaranteed 20,000-mile service interval. The AMSOIL OE 5W-30 is another robust option that fights sludge and deposits effectively with its 100% synthetic formulation, ensuring clean engine internals.
For vehicles with significant mileage, specifically those exceeding 75,000 miles, the AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil is the recommended solution. Its unique chemistry includes boosted detergents and dispersants that help clean the engine while reducing sludge by 67%. This formulation is designed to protect aging engine seals and reduce oil consumption, ensuring the vehicle continues to perform efficiently. Pairing these oils with the AMSOIL Oil Filter EA15K12-EA provides a comprehensive protection system. This filter is engineered to offer 99% filtration efficiency at 20 microns, capturing small wear-causing contaminants that standard filters might miss. The filter also allows for lower restriction, keeping critical engine parts properly lubricated and extending the time between changes.
Transmission and Differential Maintenance
The powertrain of the 2009 Forester includes both automatic and manual transmission options, each requiring specific fluid types for optimal operation. For vehicles equipped with an automatic transmission (TZ1B8….SL097), the total fill capacity is 9.8 quarts. The AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is designed to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. It remains fluid in sub-zero temperatures, ensuring reliable shifting performance in cold weather. For a more budget-conscious approach that still delivers synthetic benefits, the AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is an excellent choice. It resists sludge formation, guards against leaks, and promotes smooth, shudder-free shifts.
Manual transmission models (TY758 5-SPD….GL-5) generally require 7.4 pints of fluid. In these applications, the differential and transfer case also require attention. For differentials with automatic transmissions (GL-5, Above 0/90), the capacity is 2.5 pints, while rear differentials (GL-5, Above 0/90) hold 1.7 pints. When manual transmissions are involved, the fluid capacity for the transmission is 7.4 pints, requiring GL-5 rated lubricants. The AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube is a top-tier choice, containing friction modifiers suitable for limited-slip applications and helping to reduce operating temperatures. For colder conditions or specific gear ratios requiring a thinner fluid, AMSOIL SEVERE GEAR® 75W-90 provides advanced protection against wear and thermal runaway. Additionally, the AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube is available for those needing extra protection under extreme loads. For the most demanding long-term maintenance needs, the AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube offers a specialized 500,000-mile service life in suitable applications.
Coolant, Brake Fluid, and Seasonal Care
Coolant capacity for the 2009 Subaru Forester varies by transmission type, with 7.1 quarts required for the automatic transmission and 7.2 quarts for the manual. Proper cooling is essential to prevent overheating, which can lead to severe engine damage. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is an ethylene glycol-based, 50/50 pre-mix that protects all cooling system metals, gaskets, and hoses. It is free of phosphates, nitrates, nitrites, silicates, borates, and amines, ensuring compatibility with a wide variety of vehicle components. For those who prefer to mix their own, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is a concentrated option that offers protection up to 150,000 miles or 5 years.
Brake safety cannot be overlooked. The 2009 Forester utilizes a DOT 3 hydraulic AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid ensures excellent ABS and traction-control responsiveness by maintaining stable viscosity across a wide temperature range. This fluid resists boiling points and moisture absorption better than conventional fluids, preserving the integrity of the braking system. For vehicle owners who store their Forester seasonally, AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, preventing varnish and gum buildup that can clog fuel systems. AMSOIL Engine Fogging Oil can be used to protect internal components during long periods of inactivity.
To further enhance fuel system health, the AMSOIL P.i.® Performance Improver Gasoline Additive can be added to the fuel tank. This additive helps restore up to 14% horsepower and cleans GDI fuel injectors, restoring them to 100% flow rate. It also reduces the need for costly higher-octane fuel and helps prevent carbon buildup and pre-ignition knock. For those looking to clean the fuel system’s upper cylinders and injectors with every tank, the AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor is a valuable addition.
About the Vehicle
The 2009 Subaru Forester represents a significant chapter in the history of the brand’s compact SUV lineup. Built on the Subaru Global Platform, which shares DNA with the boxer engine layout, this vehicle is celebrated for its symmetrical all-wheel-drive system. This system delivers power to all four wheels for improved traction, making the Forester a highly capable vehicle for diverse driving conditions, from icy winter roads to light off-road trails. The 2.5-liter EJ253 engine, a naturally aspirated four-cylinder, is a staple of Subaru’s mid-size engine family. It is known for its reliability and smooth power delivery, although like many naturally aspirated engines of its era, it benefits greatly from synthetic oils to maximize its lifespan and performance efficiency.
Owners of the 2009 Forester often appreciate its practical interior space, which offers ample room for cargo and passengers despite its compact exterior dimensions. The vehicle’s reputation for safety is bolstered by its robust construction and standard all-wheel-drive system, which enhances stability in adverse weather. Over the years, the Forester has become a go-to choice for outdoor enthusiasts, pet owners, and urban commuters alike, balancing versatility with a comfortable ride. The EJ253 engine’s flat-four configuration contributes to a lower center of gravity, which improves handling dynamics and cornering stability. While it may not offer the raw horsepower of turbocharged models, the 2.5L engine provides consistent, linear power that is well-suited for daily driving. Regular maintenance using high-quality synthetic fluids ensures that the 2009 Forester remains a reliable and enjoyable vehicle for years to come.