The 2009 Mercedes-Benz R350 with its 3.5-liter V6 engine is a sophisticated piece of automotive engineering that requires precise lubrication to maintain its performance and longevity. Unlike standard vehicles, European cars of this era often demand specific oil formulations and fluid viscosities to meet the manufacturer’s strict standards for engine protection and fuel efficiency. Using the correct AMSOIL 5W-40 FS 100% Synthetic European Motor Oil or AMSOIL 0W-40 FS 100% Synthetic European Motor Oil ensures that your R350’s engine components are protected against the wear, heat, and thermal stress associated with both daily commuting and spirited driving. Proper maintenance of your transmission, cooling system, and AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is equally critical to preventing costly repairs and preserving the vehicle’s smooth driving dynamics.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – This European-formulated synthetic oil is specifically designed to meet the demanding requirements of Mercedes-Benz engines, offering superior protection against high temperatures and engine sludge.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An excellent choice for extreme cold weather starts and high-load conditions, this viscosity grade provides a robust oil film to protect critical engine parts while maintaining fuel economy.
- AMSOIL Oil Filter – Engineered for maximum filtration efficiency, this filter captures 99% of contaminants at 20 microns to keep your engine clean and extend the life of your synthetic oil.
- WIX Oil Filter – A premium aftermarket alternative that offers improved media performance compared to standard OEM filters, ensuring reliable flow and filtration for your 3.5L engine.
- MANN-FILTERS Oil Filter – A high-quality OEM-equivalent filter designed to provide excellent filtration and flow characteristics for European vehicles.
- MANN-FILTERS Air Filters – Ensures your engine breathes efficiently by trapping dust and debris while maintaining optimal airflow for combustion.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 pre-mixed formula that provides protection up to 150,000 miles or five years, safeguarding your cooling system against corrosion and overheating.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that allows for custom mixing ratios, offering extended service intervals and superior thermal stability for demanding driving conditions.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing and elevated temperatures, this fluid provides exceptional wear protection for the 722.9 transmission found in the R350.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – An OE-approved fluid that meets the specific frictional requirements of Mercedes-Benz automatic transmissions, ensuring smooth shifting and reduced transmission wear.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides stable viscosity over a wide temperature range, ensuring excellent responsiveness for ABS and traction control systems while resisting boiling under heavy braking.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Formulated to resist heat and protect seals, this fluid ensures quiet operation and long service life for both belt-driven and electro-hydraulic power steering systems.
Proper lubrication extends beyond just the engine oil. The cooling system in your R350 plays a vital role in managing the heat generated by the 3.5L V6. Over time, standard coolants can break down, leading to corrosion and reduced heat transfer efficiency. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant uses a unique poly-organic acid technology that resists breakdown, protecting aluminum heads, gaskets, and hoses. Alternatively, the concentrated AMSOIL Propylene Glycol Antifreeze and Engine Coolant allows for precise mixing to match your local climate and maintenance schedule. With a capacity of 10 quarts, ensuring the correct volume is used is essential for optimal thermal management.
The automatic transmission in the 2009 R350, particularly the 722.9 variant, operates under significant stress. It relies on precise hydraulic pressure and specific friction modifiers to shift smoothly. Using a standard fluid that does not meet Mercedes-Benz specifications can lead to harsh shifting or premature wear. The AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is engineered to handle the rigors of towing and challenging terrain while maintaining fluidity in sub-zero temperatures. For those seeking an OE-approved solution, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers excellent protection against wear and sludge. The total fill capacity for this transmission is 9.5 quarts, so having the right amount of fluid is crucial for proper operation.
Brake and steering systems are the primary safety components on your R350. The hydraulic systems require fluids that do not absorb moisture or boil under stress. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid offers a higher boiling point and superior stability than conventional fluids, ensuring consistent pedal feel and ABS responsiveness. For the power steering system, whether it is belt-driven or electro-hydraulic, AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid helps keep seals soft to prevent leaks and provides strong anti-wear protection. This synthetic fluid resists heat buildup and maintains performance in extreme cold, ensuring quiet and smooth steering operation throughout the year.
While the mechanical systems require regular fluid changes, the engine itself benefits greatly from fuel system maintenance. Carbon buildup can restrict flow and reduce efficiency over time. AMSOIL P.i.® Performance Improver Gasoline Additive is a powerful solution that restores fuel injectors and can help recover lost horsepower. For vehicles that sit in storage, AMSOIL Gasoline Stabilizer keeps fuel fresh for up to 12 months, preventing varnish and gum buildup. During extended periods of inactivity, AMSOIL Engine Fogging Oil provides internal rust prevention by coating cylinder walls and other internal components.
Vehicle Background
The 2009 Mercedes-Benz R350 represents a unique chapter in the brand’s history, blending the versatility of a crossover with the luxury and performance of a premium sedan. Built on the M-Class platform, this model was designed to offer a spacious, practical interior without sacrificing the refined driving dynamics that Mercedes-Benz is famous for. Under the hood, the 3.5-liter V6 engine provided a smooth and potent power delivery, making it a capable choice for both city driving and highway cruising. The R350 was known for its comfortable ride quality, advanced safety features, and the signature Mercedes-Benz interior craftsmanship. It appealed to families and professionals who needed a versatile vehicle that could handle daily commuting, long road trips, and towing needs with ease. The R-Class lineup, of which the R350 was a part, was a pioneer in the “sport utility sedan” segment, offering a driving position that was higher and more commanding than a typical car while maintaining a lower center of gravity than traditional SUVs. Its reputation for quality and its sophisticated engineering make it a sought-after vehicle for enthusiasts who appreciate German automotive heritage.
Maintenance Details and Capacities
To perform a complete maintenance service on your 2009 R350, specific volumes must be observed. The engine oil capacity for the 3.5L V6 engine is 8.5 quarts when changing the oil filter. It is important to use the correct torque of 22 ft-lbs for the oil drain plug to ensure a secure fit without damaging the thread. After refilling, always check the oil level using the dipstick or electronic sensor to ensure the correct amount is present. For the cooling system, a full capacity of 10 quarts is required. The automatic transmission fluid capacity is 9.5 quarts for a total fill. Additionally, transfer case lubricant capacities vary depending on the specific configuration, with some units requiring 1.1 pints. Front and rear differential capacities are typically around 2.3 pints each. Adhering to these specifications ensures that all components are adequately lubricated for peak performance and durability.