The 2007 Subaru Legacy with the 2.5L engine requires a specific viscosity of SAE 5W-30 for all temperatures to ensure proper lubrication during cold starts and high-temperature operation. The engine oil capacity is 4.4 quarts when including the filter. After refilling, the oil level must be checked to ensure the correct amount is present. The oil drain plug requires a torque specification of 33 ft-lbs. Using AMSOIL synthetic motor oils allows you to follow extended change intervals, reducing the frequency of maintenance while keeping the engine cleaner and cooler than with conventional oils.
Transmission and Differential Maintenance
For the automatic transmission, which is the most common configuration for the 2007 Legacy 2.5L, the total fill capacity is 9.8 quarts. It is crucial to use a fluid that maintains viscosity and resists breakdown under the thermal stress of a continuously variable torque converter. The AMSOIL Signature Series Multi-Vehicle Automatic Transmission Fluid is ideal for this application, as it is formulated to handle the rigors of modern transmissions. For manual transmission owners, the capacity is 7.4 pints, and the fluid requirement is a GL-5 gear lube. While standard 80W-90 is often used, the AMSOIL SEVERE GEAR 75W-90 Synthetic Gear Lube provides superior protection against wear and thermal runaway, which is particularly beneficial for vehicles used in stop-and-go traffic or mountainous terrain.
The differential system on the Legacy also benefits from high-quality synthetic lubrication. The front differential, typically found on All-Wheel Drive models, has a capacity of 2.5 pints, while the rear differential holds 1.7 pints. Both are rated GL-5. The AMSOIL SEVERE GEAR series is designed to handle the high pressure of hypoid gears found in Subaru differentials. Using these synthetic gear lubes helps reduce operating temperatures and prevents rust and corrosion, extending the life of the seals and gears. For those seeking the longest possible service interval, the AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube is a specialized option engineered for high-mileage service life.
Brake system maintenance is another critical aspect of vehicle care. The 2007 Legacy uses a hydraulic brake fluid system requiring DOT 3 specifications. Over time, brake fluid absorbs moisture from the atmosphere, which lowers its boiling point and can lead to brake fade or corrosion within the ABS module. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid offers a higher boiling point and superior viscosity stability compared to conventional fluids. This ensures that the braking system responds quickly and reliably, even under heavy use or in extreme weather conditions.
Cooling System and Additional Protection
Proper coolant selection is vital for the longevity of the EJ253 engine. The Legacy cooling system capacity varies by transmission type: 6.8 quarts for manual transmission models and 6.7 quarts for automatic transmission models. AMSOIL Antifreeze & Coolant provides protection against corrosion, scale, and freezing. The ethylene glycol formulation is compatible with all coolant colors and free of phosphates, nitrites, and borates, which can be harmful to certain engine components. For those who prefer concentrated coolants that require mixing, the AMSOIL Propylene Glycol option offers a non-toxic alternative with exceptional corrosion protection.
About the Vehicle
The 2007 Subaru Legacy is a mid-size sedan that has built a reputation for rugged reliability and all-weather capability. As part of the fifth generation of the Legacy line, it continued Subaru’s long-standing commitment to symmetry with its Symmetrical All-Wheel Drive system. This drivetrain layout is not just about traction; it provides a lower center of gravity and improved balance, resulting in a ride that feels stable and composed on winding roads or slippery pavement. The base model features the 2.5-liter horizontally opposed four-cylinder engine, known as the EJ253. This engine is a naturally aspirated version of Subaru’s legendary boxer platform, offering a smooth power delivery and a distinctive, low-pitched engine note that many enthusiasts appreciate.
Owners of the 2007 Legacy often value the vehicle for its safety and practicality. The sedan body style provides a generous amount of interior space for both passengers and cargo, making it a practical choice for families or commuters. The flat-four engine design also contributes to better handling dynamics because the low mounting position of the engine reduces the vehicle’s center of gravity, making it feel more agile than its weight class would suggest. While it may not match the horsepower of modern turbocharged rivals, the Legacy is prized for its predictability and ease of maintenance.
However, like any vehicle, the 2007 Legacy has specific issues that owners should be aware of, especially as the vehicle has aged. One common problem associated with the EJ253 engine is excessive oil consumption. This occurs as the piston rings and valve seals wear over time, leading to higher oil levels required between changes. Switching to a high-mileage synthetic oil like the AMSOIL 5W-30 High-Mileage Motor Oil can help mitigate this issue by providing enhanced seal conditioning and superior detergent packages to clean up existing sludge. Another potential concern is the degradation of rubber seals and gaskets due to heat cycling, which can lead to oil leaks. Synthetic lubricants are less prone to thermal breakdown, helping to keep seals pliable and reducing the likelihood of leaks.
A third common issue is the buildup of carbon deposits, particularly in the intake ports and on the intake valves, which can degrade performance and fuel economy. Using an upper cylinder lubricant or a high-quality fuel additive can help prevent and reduce these carbon deposits, restoring airflow and engine efficiency. Finally, the transmission fluid in automatic models can become contaminated over time, leading to harsh shifting or shuddering. Regular fluid changes using a high-quality synthetic ATF like the AMSOIL Signature Series Multi-Vehicle Automatic Transmission Fluid can rejuvenate the transmission, ensuring smooth shifts and protecting the internal clutches and bands from premature wear. By addressing these specific vulnerabilities with premium synthetic lubricants, owners can extend the life of their 2007 Legacy and keep it running smoothly for many more miles.