The 2007 Subaru Forester equipped with the turbocharged 2.5L EJ255 engine is a capable all-weather vehicle, but its longevity depends heavily on how well it is maintained. Proper lubrication is not just about keeping moving parts sliding; it is about protecting the turbocharger, managing heat, and preventing sludge buildup that can clog critical oil passages. For this specific engine, following the correct fluid specifications and addressing known factory design issues is essential for drivers who want maximum performance and reliability from their machine.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Offers unsurpassed engine protection for up to 25,000 miles, providing 75% more protection against horsepower loss and wear compared to conventional oils. It is specifically engineered to protect turbochargers 72% better than required by GM dexos1 Gen 2 standards.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Provides extended-life protection for up to 20,000 miles with 37% more cleaning power to help keep the engine running smoother for a longer duration.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – A cost-effective option that outperforms conventional oils and features a 100% synthetic formulation designed to fight sludge and deposits effectively.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Formulated with unique chemistry for vehicles over 75,000 miles, offering a boosted detergent package to reduce sludge and enhanced anti-wear additives for older engines.
- AMSOIL Oil Filter – Provides superior filtration efficiency of 99% at 20 microns, allowing for lower restriction and greater capacity to capture small, wear-causing contaminants while offering extended service life.
- WIX Oil Filter – A premium OEM-branded alternative that offers improved media quality over standard factory filters for reliable filtration.
- WIX Air Filter – Features premium media that delivers improvements over original equipment manufacturer branded filters to ensure optimal airflow for the turbocharged engine.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation that protects cooling system metals, gaskets, and hoses for up to 150,000 miles or 5 years.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Promotes smooth, shudder-free shifts and guards against leaks with excellent cold-weather performance.
- AMSOIL SEVERE GEAR 80W-90 100% Synthetic Gear Lube – Offers advanced protection against wear, controls thermal runaway, and contains friction modifiers ideal for limited-slip applications in differentials and manual transmissions.
- AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube – Provides long oil, seal, and equipment life while helping reduce operating temperatures in all-season conditions.
- AMSOIL SEVERE GEAR 75W-110 100% Synthetic Gear Lube – A robust option for heavy-duty protection in extreme conditions, ensuring reliable lubrication for all gear applications.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with stable viscosity across a wide temperature range.
- AMSOIL P.i. Performance Improver – Restores up to 14% horsepower and cleans fuel injectors to 100% flow rate, which is particularly beneficial for maintaining the efficiency of a turbocharged engine.
Choosing the right oil viscosity is critical for the 2007 Forester’s 2.5L turbo engine. While SAE 10W-30 and 10W-40 are suitable for temperatures above -20°C, SAE 5W-30 is the preferred choice for all temperature ranges. The total oil capacity for a complete change, including the AMSOIL Oil Filter replacement, is 4.5 quarts. After refilling, it is vital to check the oil level to ensure accuracy. The oil drain plug should be torqued to 33 ft/lbs to prevent leaks or stripping. Due to specific factory design issues identified in Subaru Service Bulletin #02-103-07 regarding premature clogging of the oil mesh screen in turbocharged models, it is essential to adhere to stricter drain intervals. Subaru officially recommends changing oil and filters every 3,750 miles or 3 3/4 months for 2010 model years and prior. Using high-quality synthetic oils like AMSOIL Signature Series can help mitigate these risks by keeping the oil cleaner and flow unobstructed for longer.
For the cooling system, capacity varies slightly depending on the transmission type. Automatic models with the ATXL7 require 7.7 quarts, while manual models with the MTXL require 7.8 quarts. AMSOIL offers two primary cooling solutions: the Passenger Car & Light Truck Antifreeze & Coolant (ANTPC1G-EA) and the Propylene Glycol Antifreeze and Engine Coolant (ANT1G-EA). Both formulas are phosphate, nitrate, nitrite, silicate, borate, and amine-free, ensuring compatibility with all coolant colors and protection for all metals, gaskets, and hoses. These coolants are designed to prevent freezing and boiling, offering protection for up to 150,000 miles or 5 years, whichever comes first.
Transmission and Drivetrain Lubrication
Subaru’s Symmetrical All-Wheel Drive system places unique demands on the transmission and differentials. For automatic transmissions, the total fill capacity is 9.8 quarts. AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid and OE Multi-Vehicle Automatic Transmission Fluids are recommended to handle the heat and torque of the turbo engine. These fluids resist sludge formation and provide a stable viscosity, ensuring smooth shifts and preventing shudder. For manual transmissions, the capacity is 7.4 pints. AMSOIL SEVERE GEAR lubricants are ideal here, providing friction modifiers that are beneficial for limited-slip differentials often found in Subaru models. The front differential requires 2.5 pints, while the rear requires 1.7 pints. Whether you choose 80W-90, 75W-90, or 75W-110, these synthetic gear lubes control thermal runaway and reduce operating temperatures, extending the life of the gears and bearings.
Venting and Air Filtration
A clean air filter is just as important as clean oil for a turbocharger. The turbo system relies on precise airflow to function efficiently and cool the intake charge. The WIX Air Filter (46116-EA) is a recommended upgrade that offers premium media improvements over standard OEM filters. This ensures that no dust or debris enters the turbocharger, which could cause imbalance or blade damage. Maintaining a clean air path supports the engine’s ability to produce consistent power and reduces the strain on the intake system.
Common Subaru Forester Issues and Synthetic Solutions
While the 2007 Forester is a robust vehicle, owners should be aware of specific mechanical challenges associated with the EJ255 engine. The primary issue is the premature clogging of the oil mesh screen inside the oiling system that supplies the turbocharger. This design flaw can lead to oil starvation and catastrophic turbo failure. AMSOIL synthetic oils are highly effective in this regard because they maintain better flow characteristics and contain advanced detergents that help keep the screen cleaner for longer periods between changes. By following the recommended 3,750-mile interval and using high-performance synthetics, owners can significantly reduce the risk of this specific failure mode.
Another common concern with this vehicle generation is carbon buildup on the intake valves and fuel injectors, especially given the direct injection characteristics of some variants and the general tendency for carbon accumulation in turbocharged engines. This buildup can degrade fuel economy and horsepower. Using AMSOIL P.i. Performance Improver gasoline additive can help restore injectors to 100% flow rate and clean carbon deposits, effectively boosting horsepower and fuel efficiency. Additionally, older Foresters may experience oil consumption or leaks due to hardened seals. The AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil contains specific seal conditioners that help restore flexibility to aging seals, reducing leaks and controlling oil consumption without the need for immediate gasket replacement.
Model History and Performance
The 2007 Subaru Forester represents a pivotal moment in the crossover SUV market, blending the rugged utility of a traditional 4×4 with the maneuverability of a compact car. This model year features the “sophisticated compact” design language of the second generation, known for its vertical tailgate, high beltline, and spacious interior that maximizes cargo volume despite a relatively small footprint. It was widely praised for its standard Symmetrical All-Wheel Drive, which provides exceptional traction in snow, rain, and off-road conditions, making it a favorite among drivers in northern climates.
Under the hood, the 2.5L EJ255 engine is the heart of the performance version of this vehicle. Unlike the naturally aspirated 2.5L engines found in other trims, the turbocharged EJ255 produces significantly more power, delivering around 225 horsepower and a robust 217 lb-ft of torque. This powertrain allows the Forester to compete with smaller sports sedans in terms of acceleration while retaining the ground clearance and safety features Subaru is known for. The engine’s boxer configuration lowers the center of gravity, enhancing handling dynamics and cornering stability.
Owners of this generation Forester often appreciate its versatility. It serves equally well as a family hauler, a winter commuting companion, or a weekend exploration vehicle. The high seating position offers excellent visibility, and the flat load floor with foldable rear seats makes it practical for transporting large items. However, the turbocharged model requires more meticulous maintenance than its naturally aspirated counterpart. The heat generated by the turbocharger puts additional stress on the engine and cooling system, making the use of high-quality synthetic fluids not just a recommendation, but a necessity for longevity. While the platform is generally reliable, the specific oil screen issue mentioned earlier is a known weak point that owners must monitor closely. Despite this, the Forester’s reputation for safety and all-weather capability remains high, and with the proper AMSOIL lubrication regimen, the 2007 model can continue to provide reliable service for years to come.