Maintaining the 2008 Mercedes Benz E350 with its 3.5L 6-cylinder engine (Engine Code 3498cc W) requires precise fluid selection to ensure longevity and optimal performance. The engine is designed to operate efficiently with specific viscosity grades that protect critical components under various driving conditions, from freezing winter mornings to high-temperature summer drives. Using the correct oil and compatible filters not only extends service intervals but also safeguards the high-precision internal tolerances of this European powerplant. Proper lubrication prevents sludge formation, reduces wear on camshafts and lifters, and ensures the engine delivers the smooth power delivery the E-Class is famous for.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – A specially formulated synthetic motor oil designed for the unique demands of European vehicles, featuring a precise blend of base oils and premium additives for superior protection in extreme temperatures.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An excellent alternative viscosity option for all-temperature protection, engineered to maintain oil flow during cold starts while providing robust high-temperature film strength for the 3.5L engine.
- AMSOIL Oil Filter – Provides 99% filtration efficiency at 20 microns, offering greater capacity for contaminants and lower flow restriction compared to standard filters to ensure maximum engine lubrication and extended service life.
- WIX Oil Filter – A premium alternative filter option featuring media that offers improvements over original equipment manufacturer branded filters for reliable engine protection.
- MANN-FILTERS Oil Filter – Another high-quality replacement option designed to meet the stringent requirements of European engineering standards for the E350.
- MANN-FILTERS Air Filters – Premium media air filters that improve airflow and filtration efficiency, ensuring the engine breathes cleanly for optimal combustion and performance.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation compatible with the 10.6-quart cooling capacity, offering protection up to 150,000 miles or 5 years against corrosion and freezing.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated formulation that requires mixing with distilled water, delivering extended protection for up to 1,000,000 miles in heavy-duty applications or 150,000 miles in passenger cars.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing and elevated temperatures, remaining fluid in sub-zero conditions for the 5-speed or 7-speed 722.6/722.9 transmissions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A fuel-efficient formulation that protects against wear and maintains optimal transmission performance for standard driving conditions.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with stable viscosity over a wide temperature range, meeting Mercedes-Benz approval requirements for safe stopping power.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks, offering strong anti-wear protection and high-temperature performance for quiet operation.
The engine oil capacity for the 2008 Mercedes Benz E350 is 8.5 quarts when including the filter replacement. It is important to note that on models equipped with an oil cooler, additional oil may be required if the cooler is drained during the service. After refilling the engine, drivers should allow at least five minutes for the oil to settle before checking the oil level for an accurate reading. The oil drain plug should be torqued to 22 ft/lbs to ensure a proper seal without damaging the threads.
AMSOIL 5W-40 FS is designed specifically for gasoline, diesel, and hybrid European vehicles, featuring a European formula that blends synthetic base oils with premium additives. This ensures the fluid meets the exacting standards required by Mercedes-Benz. Similarly, the 0W-40 FS variant offers the same premium protection with a lower viscosity for improved cold-start flow. Both oils provide extensive service intervals and superior wear protection compared to conventional mineral oils.
For the cooling system, the 2008 E350 requires approximately 10.6 quarts of AMSOIL Passenger Car & Light Truck Antifreeze & Coolant. This 50/50 pre-mix formulation protects all cooling system metals, gaskets, and hoses. It is free from phosphates, nitrates, nitrites, silicates, borates, and amines, making it safe for all engine components. For those who prefer a concentrated option, the AMSOIL Propylene Glycol Antifreeze offers long-life protection and compatibility with all other antifreeze colors.
The automatic transmission in this vehicle is a critical component that benefits greatly from synthetic fluids. The 5-speed 722.6 transmission has a total fill capacity of 9.7 quarts. The 7-speed 722.9 transmission, which may have variations based on the reduced-friction code A89 on the datacard, also has a total fill of 9.7 quarts. The AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is engineered to withstand heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero temperatures. The AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is an excellent choice for protecting against wear during standard driving.
Essential Fluids for Vehicle Health
Proper brake maintenance is just as critical as engine care. The 2008 E350 requires AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid meeting DOT 3 and DOT 4 standards, specifically products approved on MB Sheet 331.0. This fluid ensures reliable stopping power and resistance to brake fade caused by high heat. It provides stable viscosity across a wide temperature range, enhancing ABS responsiveness.
Power steering systems in the E350 also benefit from synthetic fluids. The AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid helps keep seals soft to prevent leaks and resists heat degradation. This fluid is formulated for quiet operation and provides excellent high-temperature protection, ensuring smooth steering regardless of weather conditions.
About the Vehicle
The 2008 Mercedes-Benz E350 is a benchmark in the executive sedan segment, representing the peak of the W211 generation. This model is powered by the M272 3.5-liter V6 engine, a unit renowned for its smooth power delivery, refined acoustics, and responsive throttle characteristics. Unlike its turbocharged siblings or the larger V8 variants, the naturally aspirated 3.5L V6 offers a balance of performance and efficiency that appealed to a wide range of drivers, from daily commuters to luxury enthusiasts.
Known for its exceptional build quality and safety features, the E-Class has consistently ranked high in industry reliability and durability surveys. The E350 in particular is celebrated for its comfortable ride quality, which blends sporty handling with a quiet, plush interior. The platform was designed to accommodate advanced technology while maintaining the traditional Mercedes-Benz driving dynamics. Whether navigating city streets or cruising on highways, the E350 provides a sense of stability and confidence that has made it a favorite among owners. Its reputation for longevity makes regular maintenance with high-performance synthetic fluids an essential investment for keeping the car running smoothly for years to come.