The 2008 Mitsubishi Galant equipped with the 3.8-liter 6-cylinder engine (Engine Code 6G75) is a sedan that demands precise lubrication to maintain its performance and longevity. This vehicle features a robust powerplant that relies on the correct viscosity and additive package to ensure smooth operation, particularly regarding the oil pump and valve train. Selecting the right synthetic motor oil is critical because it reduces friction, manages heat better than conventional oils, and extends the life of internal components. For owners looking to maximize the potential of their Galant, choosing from a range of high-performance AMSOIL synthetic fluids ensures that every moving part receives superior protection against wear, sludge, and the harsh conditions of daily driving.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – Provides the highest level of protection with up to 25,000 miles of use, offering exceptional resistance to oxidation and shear stability for this 3.8L engine.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – Delivers up to 20,000 miles of protection with enhanced cleaning power to help keep the engine running smoother and reduce deposit buildup.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – A cost-effective 100% synthetic option that fights sludge and deposits while outperforming conventional oils in wear protection.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for engines with over 75,000 miles, featuring boosted detergents to clean the engine and reduced sludge for better performance.
- AMSOIL Oil Filter – Engineered for extended service life with 99% filtering efficiency at 20 microns, ensuring contaminants are captured effectively to protect the engine.
- WIX XP Oil Filter – Features premium media that offers improvements over standard OEM-branded filters for reliable filtration of engine oil.
- WIX Oil Filter – A trusted OEM-style filtration option with premium media to capture wear-causing contaminants from the 3.8L engine.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 pre-mix ethylene glycol formula that provides protection up to 150,000 miles and is compatible with all cooling system metals.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option requiring mixing with water, offering extended protection for up to 150,000 miles or 5 years in passenger cars.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing, elevated temperatures, and challenging terrain while maintaining fluidity in sub-zero conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Promotes smooth, shudder-free shifts and resists harmful sludge with excellent cold-weather performance.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Designed to improve ABS and traction-control responsiveness with a stable viscosity over a wide temperature range.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks, with excellent high-temperature protection.
- WIX Air Filter – Provides premium filtration performance to ensure clean air intake for the 3.8L V6 engine.
- WIX Oil Filter – Designed for the automatic transmission to protect internal components from wear and contamination.
Engine Oil Specifications and Capacity
For the 2008 Mitsubishi Galant with the 3.8-liter 6-cylinder engine, maintaining the correct oil viscosity is essential for engine health. The manufacturer specifies SAE 5W-20 as the preferred viscosity for all temperatures. This oil grade ensures proper lubrication during cold starts and maintains stability under the operating temperatures of the 6G75 engine. The total fluid capacity, including a standard filter replacement, is 4.9 quarts. When performing an oil change, it is crucial to add the specified amount and then check the oil level after the refill to ensure accuracy.
The torque specification for the oil drain plug is set between 26 and 32 ft/lbs. Stripping the threads on the drain plug is a common issue if the plug is over-tightened, so using a torque wrench is recommended to adhere to these specifications. The engine requires a motor oil that meets current API standards, and AMSOIL synthetic formulations exceed these requirements. AMSOIL oils provide protection up to 25,000 miles or one year when using Signature Series, significantly reducing the frequency of maintenance compared to conventional oils. For vehicles with higher mileage, the High-Mileage formula includes a unique chemistry designed to condition seals and reduce sludge, which is beneficial for older engines that may have accumulated deposits over time.
Filtration Systems for the 3.8L Engine
A quality oil filter is just as important as the oil itself. The filtration system ensures that contaminants, such as metal shavings, dust, and combustion byproducts, are removed from the circulating oil. AMSOIL recommends the AMSOIL Oil Filter for those seeking maximum efficiency. This filter offers 99% filtration efficiency at 20 microns, which is a standard metric for capturing small, wear-causing particles. It also features greater capacity for contaminants than many competing filters, allowing for extended service intervals without clogging.
For vehicle owners who prefer OEM-style filtration, the WIX Oil Filter and the WIX XP Oil Filter are excellent choices. Both utilize premium media that improves upon original equipment manufacturer standards. The WIX XP series, in particular, offers advanced filtration capabilities that help keep the engine clean and the oil flow unrestricted, ensuring the 3.8L engine receives adequate lubrication even under severe driving conditions.
Transmission and Cooling System Care
The automatic transmission in the 2008 Galant is a critical component that benefits greatly from synthetic fluid. The fluid capacity for the total fill in the 5-speed F5A5A-4 transmission is 8.9 quarts. Using a high-quality synthetic automatic transmission fluid protects against the wear, sludge, and temperature-related problems that can lead to costly repairs. The AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is engineered to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. It remains fluid in sub-zero temperatures and provides reserve protection during heavy use, ensuring smooth, shudder-free shifts.
The cooling system capacity for the 2008 Mitsubishi Galant is 9.2 quarts. Keeping the engine at the optimal temperature is vital for efficiency and preventing overheating. AMSOIL offers two main cooling solutions: the AMSOIL Passenger Car & Light Truck Antifreeze & Coolant and the AMSOIL Propylene Glycol Antifreeze and Engine Coolant. The Passenger Car & Light Truck version is a 50/50 pre-mix ethylene glycol formulation that provides protection up to 150,000 miles or 5 years. It is free from phosphates, nitrates, and silicates, making it safe for all cooling system metals. The Propylene Glycol version is a concentrated coolant that requires mixing with distilled water, offering the same extended protection and compatibility with various vehicle types.
Brake and Power Steering Fluids
Safety is paramount when maintaining a vehicle, and the braking system requires fluid that can withstand high temperatures without boiling. The recommended brake fluid is the AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid. This fluid is designed for hydraulic brake systems and provides excellent responsiveness for ABS and traction control systems. It maintains a stable viscosity across a wide temperature range, ensuring consistent braking performance in all weather conditions.
The power steering system also benefits from synthetic fluid. The AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid is formulated to reduce friction and help seals remain soft, which prevents leaks. It offers strong anti-wear protection and excellent high-temperature performance, ensuring quiet operation and long fluid life. This fluid is suitable for the specific requirements of the Galant’s power steering system.
Additional Maintenance Products
For a comprehensive maintenance routine, the WIX Air Filter helps ensure the engine breathes clean air, which is crucial for fuel efficiency and power output. Fuel additives like the AMSOIL P.i.® Performance Improver Gasoline Additive can restore up to 14% horsepower and clean fuel injectors, improving fuel economy and controlling pre-ignition knock. For seasonal storage, the AMSOIL Gasoline Stabilizer keeps fuel fresh for up to 12 months, protecting against varnish and gum buildup, while the AMSOIL Engine Fogging Oil protects internal components from rust during periods of inactivity.
About the Vehicle
The 2008 Mitsubishi Galant is a well-regarded mid-size sedan that represents a solid chapter in Mitsubishi’s American market history. This generation of the Galant, particularly the ES and GT models, is celebrated for its spacious interior and comfortable ride quality. The 3.8-liter V6 engine, known as the 6G75, is the powerhouse of the lineup, delivering substantial horsepower and torque that makes for confident acceleration and smooth highway merging. This engine is part of Mitsubishi’s successful V6 family, known for durability and a relatively smooth power delivery that suits both daily commuting and spirited driving.
As a vehicle of its era, the 2008 Galant prioritizes a balance of reliability and value. It features a well-tuned suspension that absorbs road imperfections effectively, making it a comfortable choice for long-distance travel. The interior design focuses on ergonomics, providing ample legroom for both front and rear passengers. While it may not compete with luxury sedans in terms of high-tech features, the Galant earned a reputation for mechanical soundness and user-friendly operation. The GT trim often attracted enthusiasts who appreciated the V6 powertrain and the manual transmission option available in some model years, though the automatic variants offer convenience for a wide range of drivers. Owners of this vehicle often find it to be a practical, long-term investment that holds up well when given the proper care, including the high-quality synthetic lubrication recommended for its components.