The 2009 Mercedes-Benz E550, powered by its robust 5.5L 8-cylinder engine, demands lubricants that can withstand both high-performance driving and the specific engineering tolerances of German manufacturing. Proper fluid selection is not merely about maintenance; it is a critical investment in the longevity and reliability of this luxury sedan. The engine’s precise tolerances and the complex nature of its automatic transmission system require oils and fluids that offer superior protection against wear, thermal breakdown, and sludge formation.
AMSOIL synthetic lubricants are engineered to exceed the rigorous requirements of European vehicles, offering a level of protection that standard mineral oils simply cannot match. Whether you are navigating city traffic or embarking on a long highway journey, using the correct viscosity and formulation ensures that your vehicle’s components operate with minimal friction and maximum efficiency. Below, we explore the specific fluids and additives that will keep your E550 running smoothly for miles to come.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – This European-formulated oil provides precise protection for the 5.5L engine, designed to handle the unique demands of high-performance gasoline and diesel vehicles.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An excellent choice for colder climates or extreme temperature variations, ensuring rapid lubrication at startup and stability under heat.
- AMSOIL Oil Filter – Delivers 99% filtering efficiency at 20 microns, offering greater capacity for contaminants and reduced restriction to keep engine parts lubricated for longer service intervals.
- WIX Oil Filter – A premium alternative media filter that offers improvements over original equipment manufacturer branded filters, ensuring reliable flow and filtration.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A ready-to-use 50/50 pre-mix formulation that protects cooling system metals, gaskets, and hoses for up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that requires mixing with distilled water, offering superior protection against metallic corrosion and erosion for extended service life.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing and elevated temperatures while remaining fluid in sub-zero conditions to protect the 5-speed transmission.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides robust protection against wear and is formulated to meet the specific requirements of the vehicle’s automatic transmission.
- AMSOIL P.i. Performance Improver Gasoline Additive – Restores up to 14% horsepower and cleans fuel injectors to improve flow, fuel economy, and combustion efficiency.
Engine Oil and Filtration Specifications
The heart of the 2009 E550 is the 5.5L 8-cylinder engine with code 273.962 U. This powerful unit requires an oil that can handle high operating temperatures and the stress of the variable valve timing system. The capacity for this engine is 9.0 quarts when performing a filter change. It is crucial to adhere to this volume to ensure the oil pump can effectively circulate fluid through all critical components.
AMSOIL offers two primary viscosities for this application, both designed with a European formula featuring a precise blend of synthetic base oils and premium additives. The AMSOIL 5W-40 FS 100% Synthetic European Motor Oil is ideal for a wide range of temperatures, providing strong protection for gasoline, diesel, and hybrid European vehicles. For those experiencing extreme cold or seeking the absolute lowest viscosity for optimal flow during startup, the 0W-40 FS variant is an excellent alternative. Both oils offer superior shear stability, meaning they maintain their viscosity grade longer than conventional oils, which is essential for the longevity of the engine’s bearings and camshafts.
Filtration is equally critical. The 2009 E550 benefits from high-efficiency filtration systems that capture microscopic wear particles. The AMSOIL Oil Filter is constructed to allow lower restriction while maintaining a high capture rate for small, wear-causing contaminants. This helps reduce engine wear and allows for extended service intervals. For owners who prefer an established aftermarket brand, the WIX Oil Filter serves as a reliable alternative, offering premium media improvements over stock OEM-branded filters.
When changing the oil, it is important to follow a strict protocol. After refilling the system with the recommended 9 quarts, always check the oil level to ensure it is within the safe operating range. Proper oil level maintenance is one of the simplest yet most effective ways to prevent engine damage and ensure optimal performance.
Cooling System and Transmission Fluids
The cooling system of the E550 plays a vital role in managing the heat generated by the V8 engine. The system capacity is approximately 11.9 quarts. To maintain optimal thermal management, owners can choose between two AMSOIL antifreeze options. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free formula that is compatible with all other antifreeze and coolant colors. It is a 50/50 pre-mix of ethylene glycol, ready to use and protecting against corrosion for up to 150,000 miles. The AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers a concentrated solution that allows for custom mixing ratios using distilled or high-quality water. This option is particularly beneficial for those looking to minimize waste or who have specific mixing requirements. It provides protection up to 150,000 miles in passenger cars and light trucks and vastly surpasses standards for metallic corrosion and erosion.
Moving to the drivetrain, the automatic transmission is another critical area for synthetic fluid investment. The 2009 E550 is equipped with a 5-speed automatic transmission (722.6), with a total fill capacity of 8.6 quarts for a complete service. Standard fluids may degrade under the heavy loads and heat generated by the E-Class, leading to sludge and wear. AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is designed 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. For those seeking an OE-focused formulation, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid also offers robust protection against wear, ensuring the transmission shifts smoothly and reliably.
Additional Maintenance and Protection
While engine and transmission fluids form the backbone of vehicle maintenance, other factors contribute to the overall health of the E550. Fuel additives play a significant role in modern engines, especially those with direct injection or high-performance characteristics. The AMSOIL P.i. Performance Improver is a powerful gasoline additive that restores up to 14% horsepower and cleans GDI fuel injectors to 100% flow rate after just one tank of fuel. It helps reduce the need for higher-octane fuel and controls pre-ignition knock, making it a valuable addition to your maintenance regimen.
For seasonal storage, the vehicle may require specific care. If the E550 is to be stored for an extended period, the AMSOIL Engine Fogging Oil can be used to protect internal engine components from rust and corrosion during inactivity. Additionally, AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, fighting ethanol corrosion and varnish buildup in the fuel system. These seasonal care products ensure that when the vehicle is started again, it remains in pristine condition, ready to deliver the performance and luxury the E550 is known for.
Other protection products for the E550 include AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor for fuel system care, and AMSOIL Synthetic Multi-Purpose Grease for chassis components. To keep the vehicle’s exterior looking new, AMSOIL Brake and Parts Cleaner ensures braking components are free of contaminants, while AMSOIL Miracle Wash Waterless Wash and Wax Spray provides shine without water. For metal protection against rust and salt, AMSOIL Heavy-Duty Metal Protector and AMSOIL MP Metal Protector offer long-lasting barrier coatings. Interior and exterior care is simplified with AMSOIL Interior Detailer – Light Lemon, AMSOIL Interior Detailer – Scent Free, AMSOIL High-Foam Car Shampoo, and AMSOIL Exterior Ceramic Spray. Cleaning and maintenance tasks are handled effectively with AMSOIL Engine Degreaser, AMSOIL Heavy-Duty Degreaser, AMSOIL Glass Cleaner, and AMSOIL Power Foam® Carburetor and Induction-System Cleaner. Finally, AMSOIL Silicone Spray protects rubber and seals, while AMSOIL Mudslinger® Mud and Dirt Repellent keeps the undercarriage clean.
About the Vehicle
The 2009 Mercedes-Benz E550 represents a pinnacle of engineering in the mid-size luxury sedan segment. Built on the W211 platform, this generation of the E-Class is widely recognized for its blend of athletic performance and sophisticated comfort. Under the hood lies the M273 5.5-liter V8 engine, a naturally aspirated powerhouse that delivers smooth, linear power characteristic of German automotive design. This engine code, 273.962 U, was a hallmark of Mercedes-Benz’s commitment to high displacement and efficiency, offering a robust alternative to turbocharged or supercharged competitors of the era.
Owners of the E550 typically appreciate the vehicle’s refined driving dynamics. The combination of the lightweight aluminum engine block, precise suspension tuning, and the robust 5-speed automatic transmission creates a driving experience that is both serene and engaging. The E-Class sedan was designed to be a “driver’s car” without sacrificing the plush ride quality expected of the brand. Whether used as a daily commuter or a long-distance cruiser, the E550 provides a level of stability and confidence that inspires trust in the driver.
The W211 platform, which served as the foundation for this model year, is celebrated for its structural integrity and safety features. It features a sophisticated suspension system that adapts to road conditions, ensuring a smooth ride even on uneven surfaces. The E550’s market position was strong, often competing directly with other luxury sedans while offering a distinctively German aesthetic and build quality. For enthusiasts, maintaining the E550 involves more than just routine maintenance; it is about preserving the legacy of a vehicle that defined an era of luxury performance. Regular fluid changes and the use of high-quality synthetic lubricants are the keys to unlocking the full potential of this remarkable machine, ensuring it remains a reliable and rewarding presence on the road for years to come.