The 2007 Subaru Legacy equipped with the 2.5-liter turbocharged EJ255 engine requires precise lubrication to maintain performance and longevity. Unlike naturally aspirated engines, turbocharged units operate at significantly higher temperatures and RPMs, placing unique stress on internal components. Proper fluid selection is critical not only for reducing friction but also for protecting the turbocharger from oil starvation and ensuring that the all-wheel-drive system transfers power smoothly to the road. Using high-quality synthetic lubricants tailored for this specific application helps mitigate the wear and tear associated with forced induction and the vehicle’s unique drivetrain characteristics.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Provides the highest level of engine protection, formulated to withstand the extreme heat of the turbocharger and extend service intervals up to 25,000 miles or one year.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Offers extended performance with 37% more cleaning power than the OE product, maintaining engine cleanliness for up to 20,000 miles.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – A cost-effective synthetic option that outperforms conventional oils and fights sludge, meeting OEM mileage requirements.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Specifically engineered for engines over 75,000 miles to reduce consumption and sludge while enhancing seal flexibility.
- AMSOIL Oil Filter – Features a synthetic media that captures 99% of particles down to 20 microns, reducing engine wear and offering extended service life.
- WIX Oil Filter – A premium alternative that offers superior filtration efficiency and media capacity compared to standard OEM filters.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Delivers outstanding protection against wear, heat, and sludge, ensuring smooth shifts in the automatic transmission even under heavy loads.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Provides excellent cold-weather performance and guards against leaks while promoting smooth, shudder-free shifting.
- AMSOIL SEVERE GEAR 80W-90 100% Synthetic Gear Lube – Contains friction modifiers for limited-slip differentials and helps reduce operating temperatures in the front and rear axles.
- AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube – Offers superior thermal stability and protection against rust and corrosion for the manual transmission and limited-slip differentials.
- AMSOIL SEVERE GEAR 75W-110 100% Synthetic Gear Lube – Provides enhanced protection for high-load conditions and ensures reliable lubrication in varying weather conditions.
- AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube – Engineered for extended service life with improved seal life and better cold-weather shifting characteristics.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique OAT formulation that protects cooling system metals, gaskets, and hoses from corrosion for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated, low-toxicity alternative that provides robust corrosion protection and high flash points for heavy-duty applications.
- 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.
- WIX Air Filter – Features premium media that improves airflow and filtration over OEM-branded filters to support engine performance.
For the 2007 Subaru Legacy 2.5L Turbo, selecting the correct viscosity and specification is paramount. The engine oil capacity is 4.5 quarts when including the filter. While Subaru recommends a 5W-30 viscosity for all temperatures, it is crucial to follow the service bulletin regarding oil change intervals. The EJ255 turbocharged engine is susceptible to premature clogging of the oil mesh screen inside the oiling system, a design issue that can lead to oil starvation and turbocharger failure. Consequently, adhering to a 3,750-mile or 3-month oil change interval is recommended for this model year to ensure the turbocharger receives a constant flow of clean oil. AMSOIL Signature Series synthetic oils are designed to withstand these severe service intervals, providing a robust barrier against the high heat generated by the turbo, even if you choose to extend the interval as permitted by the synthetic’s capabilities. The synthetic formulation resists breakdown and maintains viscosity better than conventional oils under the extreme thermal stress typical of turbocharged Subaru engines.
Beyond the engine, the transmission and differential systems require specific lubricants to operate efficiently. The 2007 Legacy with a 5-speed automatic transmission (TG5C7) requires approximately 10.4 quarts for a total fill. The 2007 Legacy with a manual transmission holds about 7.4 pints, while the front differential capacity depends on the specific model configuration, with a typical fill of 3 pints for the front final drive. For 4WD models, the rear differential requires additional fluid, with capacities ranging from 1.7 pints to 2.1 pints depending on the transmission type. Using a high-quality synthetic gear lube like AMSOIL SEVERE GEAR ensures that the differentials and transfer cases, which are vital components of Subaru’s all-wheel-drive system, are protected against wear and thermal runaway. The friction modifiers in these lubes are specifically beneficial for limited-slip differentials, ensuring smooth operation and reducing the risk of chatter during cornering or low-speed maneuvers.
Coolant maintenance is another critical aspect of keeping this engine healthy. The cooling system capacity varies slightly between the automatic transmission (7.6 quarts) and manual transmission (7.7 quarts) models. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant uses a unique poly-organic acid technology that protects all cooling system metals, gaskets, and hoses. This formulation is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, making it safe for use in a wide variety of vehicles and ensuring long-term protection against corrosion. The coolant is available as a pre-mixed 50/50 solution for ease of use or as a concentrated propylene glycol formula that can be mixed with distilled water for heavy-duty applications. Both options provide protection up to 150,000 miles or five years, whichever comes first, helping to prevent overheating and boil-over in high-stress driving conditions.
Vehicle Background and Performance History
The 2007 Subaru Legacy represents a significant chapter in the brand’s history, known for its blend of practicality, safety, and all-weather capability. This generation, often associated with the BH and BM chassis codes, continued Subaru’s legacy of engineering vehicles around their horizontally opposed “boxer” engine layout. This design choice lowers the center of gravity, which contributes to the car’s renowned handling stability. For the 2007 model year, the 2.5L engine was available in both naturally aspirated and turbocharged variants. The EJ255 engine powering the 2.5L Turbo model is a 16-valve, dual overhead camshaft unit that utilizes a single turbocharger to generate substantial horsepower and torque, making it a favorite among drivers who want a sedan with spirited performance capabilities without the cost of a dedicated sports car.
The Legacy’s market position has always been centered on the “active lifestyle” demographic. Owners often appreciate the vehicle for its ability to serve as a daily driver that can seamlessly transition to weekend adventures, from commuting in snow to navigating light trails or hauling gear. The standard all-wheel-drive system is a key selling point, providing a level of traction and confidence in inclement weather that few front-wheel-drive competitors can match. The interior space in the 2007 Legacy was generally regarded as spacious, offering a comfortable ride for front and rear passengers, which added to its appeal as a family sedan or a commuter vehicle for those with long daily drives.
While the Legacy is a reliable vehicle, owners of the 2007 EJ255 Turbo model should be aware of a few common issues that can arise with age and use. The primary concern, which has been the subject of manufacturer service bulletins, is the premature clogging of the oil mesh screen located within the oiling system that supplies the turbocharger. If left unaddressed, this blockage can restrict oil flow, leading to oil starvation and catastrophic turbocharger failure. This issue makes regular oil and filter changes with high-quality synthetic oil essential for these engines. Another known problem area involves the oil consumption of the EJ series engines, where piston rings may allow oil to burn off over time, particularly as the vehicle accumulates mileage. The use of AMSOIL High-Mileage Motor Oil can help mitigate this by boosting the detergent package and enhancing anti-wear additives to reduce sludge and consumption. Additionally, the vehicle’s CVT or automatic transmission fluid can degrade over time, potentially leading to shudder or harsh shifts, a problem that is best addressed with a dedicated synthetic transmission fluid like AMSOIL’s Multi-Vehicle ATF. Finally, as the vehicle ages, coolant degradation can lead to corrosion in the cooling system, necessitating the use of high-performance antifreeze to preserve the integrity of the radiator, water pump, and engine block. By addressing these specific vulnerabilities with the right lubricants, owners can significantly extend the life and performance of their 2007 Subaru Legacy.
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