Owners of the 2021 Mercedes-Benz E450 with the 3.0L 6-cylinder turbocharged engine (Code 256.930 2) require premium synthetic lubricants that can withstand the high operating temperatures and stresses associated with modern European engineering. This vehicle is equipped with a sensitive twin-scroll turbocharger and complex emission systems that demand oils with low viscosity and high thermal stability. Using the correct fluids ensures optimal performance, maximizes fuel economy, and extends the service life of the engine and transmission components. The manufacturer specifies specific viscosity grades and fluid capacities that must be adhered to for maintaining warranty coverage and ensuring reliable operation in varying climates.
Recommended AMSOIL Products
- AMSOIL 5W-30 LS 100% Synthetic European Motor Oil – The primary choice for this engine, featuring a precise blend of synthetic base oils and premium additives designed for the unique demands of gasoline and turbocharged European vehicles.
- AMSOIL 5W-40 MS 100% Synthetic European Motor Oil – An excellent alternative viscosity option that provides robust protection for vehicles operating in higher ambient temperatures or under heavy load conditions.
- AMSOIL 0W-20 LS 100% Synthetic European Motor Oil – The optimal choice for maximizing fuel efficiency and ensuring instant oil flow during cold starts, matching the manufacturer’s strict viscosity requirements for all seasons.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Delivers outstanding protection against wear and sludge for the E450’s transmission, maintaining fluidity in extreme temperatures and providing reserve protection during heavy towing or spirited driving.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective option that protects against wear and meets the necessary performance standards for automatic transmission service intervals.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation that protects cooling system metals, gaskets, and hoses while being phosphate- and silicate-free to ensure compatibility with the vehicle’s cooling system.
- 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 up to 150,000 miles or 5 years.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range, ideal for the high-performance braking systems found in this model.
The engine oil service for this specific configuration is critical. The 3.0L twin-turbo V6 engine requires a full capacity of 9 quarts when the oil filter is replaced. It is imperative to check the oil level after the refill to ensure the correct amount is present, as overfilling or underfilling can lead to performance issues. The recommended oils, such as the AMSOIL 5W-30 LS and AMSOIL 0W-20 LS, are specifically engineered with European formulas that meet the rigorous standards required by manufacturers like Mercedes-Benz. These synthetic oils provide a level of protection that surpasses conventional mineral oils, particularly in managing the heat generated by the turbochargers.
In addition to engine and transmission fluids, the cooling system plays a vital role in maintaining the longevity of the E450. The vehicle utilizes two distinct coolant configurations depending on the specific setup, with capacities noted as 14.8 quarts for the HTCC14 system and 4.2 quarts for the LTCC4 system. Using a high-quality antifreeze like the AMSOIL Passenger Car & Light Truck Antifreeze & Coolant ensures that the engine remains at the optimal operating temperature, preventing overheating in summer and freezing in winter. This fluid is formulated to be compatible with all other antifreeze and coolant colors and is free of phosphates, nitrates, and silicates, making it safe for the various metals and rubber components found in the cooling circuit.
Brake fluid is another often-overlooked component that significantly impacts safety and vehicle control. The 2021 Mercedes-Benz E450 requires a DOT 4 specification fluid. AMSOIL’s DOT 3 and DOT 4 100% Synthetic Brake Fluid is an ideal substitute that exceeds standard requirements. It offers superior resistance to moisture absorption, which lowers the boiling point and can lead to brake fade under heavy braking conditions. By using this synthetic fluid, owners can expect sharper pedal response and consistent braking performance, even after extended periods of driving in hot conditions.
About the Vehicle
The 2021 Mercedes-Benz E450 represents the pinnacle of the E-Class sedan lineup, blending luxury, performance, and advanced technology. This model year continues the legacy of the W213 platform, which was introduced to replace the previous generation E-Class. The E450 is distinguished by its powertrain, which utilizes the M256 3.0-liter inline-six engine. This powerplant is a marvel of modern engineering, featuring a twin-scroll turbocharger coupled with an integrated starter generator (ISG) as part of the 48-volt EQ Boost mild hybrid system. This combination not only delivers robust acceleration but also enhances fuel efficiency and reduces emissions, positioning the E450 as a leader in the luxury executive sedan segment.
Performance-wise, the E450 is highly regarded for its smooth and powerful delivery. The 3.0-liter engine typically produces around 362 horsepower and 369 pound-feet of torque, allowing for effortless passing power and a relaxed highway driving experience. Paired with the 9G-TRONIC automatic transmission, gear shifts are seamless and responsive, contributing to a driving character that is both refined and engaging. The vehicle’s suspension system, often equipped with adaptive damping, strikes a fine balance between a comfortable ride quality and precise handling, making it suitable for both daily commuting and spirited weekend drives. The interior is equally impressive, offering high-quality materials, ample legroom, and a sophisticated infotainment system that keeps the driver connected and entertained.
Despite its robust design, the 2021 E450 can face specific issues that benefit from high-performance lubrication. One common concern among owners is the potential for oil consumption, which can occur in high-performance turbocharged engines over time. The use of AMSOIL’s synthetic motor oils, particularly those with advanced viscosity control and leak protection additives, can help mitigate excessive oil burn and maintain proper levels between service intervals. Another issue often encountered is sludge buildup, especially in vehicles that are frequently driven in stop-and-go traffic or subjected to short-trip cycling. AMSOIL’s rigorous synthetic formulations are designed to resist oxidation and keep the engine internals clean, preventing the accumulation of harmful deposits that can choke oil passages.
Carbon buildup on the intake valves and turbochargers is a third potential problem for direct-injection turbo engines. Over time, this can lead to reduced performance and rough idling. The use of AMSOIL’s P.i. Performance Improver gasoline additive can help clean these areas, restoring fuel injector flow and maintaining optimal combustion efficiency. Finally, owners may experience heat-related issues in the cooling system, particularly if the vehicle is driven aggressively or in extreme weather conditions. The high thermal stability of AMSOIL antifreeze and engine coolant ensures that the cooling system remains effective under stress, preventing overheating and protecting the engine from thermal degradation. By addressing these common issues with premium synthetic fluids, E450 owners can enjoy years of reliable and exhilarating performance from their vehicles.