The 2021 BMW 750xi is a luxury sedan built on the fifth generation of the BMW 7 Series, featuring a potent 4.4-liter twin-turbo V8 engine. Owners of this high-performance vehicle demand the very best in lubrication to ensure longevity and optimal driving dynamics. Standard synthetic blends and conventional fluids often fall short when subjected to the extreme heat and high RPMs generated by the N63B44T3 engine. To maintain peak performance, it is essential to utilize fluids specifically engineered for the unique demands of modern European powertrains.
Recommended AMSOIL Products
For the 2021 BMW 750xi, we recommend a comprehensive fluid kit designed to protect the engine, transmission, and cooling system from the rigors of daily driving and extreme conditions.
- AMSOIL 0W-30 MS 100% Synthetic European Motor Oil – A formula designed for the unique demands of gasoline, diesel, and hybrid European vehicles, featuring a precise blend of synthetic base oils and premium additives.
- WIX Oil Filter – Offers premium media with improvements over original equipment manufacturer-branded filters to ensure maximum engine protection.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation that provides protection up to 150,000 miles or 5 years and is compatible with all cooling system metals and hoses.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated, ethylene-glycol-free option that exceeds standards for metallic corrosion and erosion in passenger cars and light trucks.
- 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.
- 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.
Engine Oil and Filtration
The heart of your 2021 BMW 750xi is the 4.4-liter 8-cylinder engine, specifically the N63B44T3 model with a 5 Turbo configuration. This high-output engine operates under significant thermal stress due to its twin-turbocharger setup. To combat this, the engine requires a fluid that maintains viscosity stability at high temperatures while flowing quickly during cold starts. The AMSOIL 0W-30 MS is engineered with a European formula that features a precise blend of synthetic base oils and premium additives.
The total oil capacity for this vehicle, including the filter, is 11.1 quarts. It is crucial to verify the oil level after the refill. When performing an oil change, remember to torque the oil drain plug to 30 ft/lbs and replace the drain plug seal to prevent leaks. The AMSOIL filter recommended for this application is the WIX Oil Filter (Product Code: 57189-EA). This filter utilizes premium media that offers improvements over standard OEM-branded filters, ensuring that oil flow is not restricted and contaminants are effectively trapped to extend the life of the engine.
Transmission and Drivetrain Protection
The 2021 BMW 750xi comes equipped with an 8-speed automatic transmission, specifically the GA8HP75Z model. Automatic transmissions in luxury sedans are complex assemblies that operate under heavy loads, especially when the vehicle is in motion at high speeds. Using a fluid designed for severe service is essential to protect against wear, sludge, and temperature-related failures.
The AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is the top recommendation for this unit. It is designed to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. This fluid remains fluid even in sub-zero temperatures, providing reserve protection during heavy use. The total fill capacity for the automatic transmission is 9.2 quarts. This fluid helps ensure smooth shifts and long-term durability for the transmission system.
Cooling System Maintenance
Proper cooling system maintenance is vital for the N63 engine, as it is sensitive to overheating. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant requirements for this vehicle vary based on the specific option codes installed. For models with code SA8238, the capacity is 7.7 quarts. If the vehicle has the SA8238.7 code, the capacity is 7 quarts. Models without these specific codes or with LTCC require 3.4 quarts.
AMSOIL offers two primary options for cooling system protection. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a 50/50 pre-mix formulation of ethylene glycol that protects all cooling system metals, gaskets, and hoses. It is phosphate, nitrate, nitrite, silicate, borate, and amine-free, ensuring compatibility with various coolant colors. Alternatively, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is a concentrated option that requires mixing with distilled or high-quality water. This formulation is designed for those who prefer an ethylene-glycol-free solution and offers protection up to 150,000 miles or 5 years.
AMSOIL Brake Fluid and Performance Additives
Brake fluid plays a critical role in the safety and responsiveness of the 2021 BMW 750xi. The vehicle’s brake system is recommended for DOT 4 Low Viscosity fluid, specifically BMW P/N 83 13 0 443 024 or 83 13 0 443 026. Maintaining the fluid’s dry boiling point is essential to prevent vapor lock, which can lead to a spongy pedal feel.
The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is an excellent replacement. It provides excellent ABS and traction-control responsiveness and maintains stable viscosity across a wide temperature range. This synthetic fluid helps ensure consistent brake performance in various driving conditions. Additionally, to keep the engine running at peak efficiency, the AMSOIL P.i. Performance Improver is a valuable gasoline additive. It helps restore up to 14% horsepower and can restore GDI fuel injectors to 100% flow rate after one tank of fuel. This additive reduces the need for higher-octane fuel and helps control pre-ignition knock.
Storage and Cleaning
For owners who engage in seasonal storage, keeping the fuel fresh is paramount. The AMSOIL Gasoline Stabilizer can help keep fuel fresh for up to 12 months, protecting against varnish and gum buildup and fighting ethanol corrosion. If the vehicle will be parked for extended periods, the AMSOIL Engine Fogging Oil is a highly effective rust preventive designed to protect internal engine components.
For general maintenance and cleanliness, the AMSOIL Engine Degreaser offers a professional-strength formula to remove the toughest grease and grime from engine surfaces. For exterior cleaning, the AMSOIL Miracle Wash Waterless Wash and Wax Spray requires just a spray and a wipe, leaving a fantastic shine and a protective finish. For the interior, the AMSOIL Interior Detailer, available in Light Lemon or Scent-Free options, provides multi-surface use with 90-day UV protection and traps odors.
About the Vehicle
The 2021 BMW 750xi represents the pinnacle of the 7 Series lineage, a nameplate that has defined the luxury sedan segment for decades. Part of the F01/F02 generation, the 750xi is distinguished by its “xi” designation, indicating BMW’s xDrive intelligent all-wheel drive system. This powertrain combination delivers a compelling mix of luxury, performance, and capability, making it a favorite among those who demand a vehicle that can handle both highway commuting and spirited driving on winding roads.
Under the hood lies the 4.4-liter N63B44T3 engine, a twin-turbocharged V8 that produces substantial horsepower and torque. The twin-turbo configuration is designed to minimize lag and provide power on demand, characteristic of BMW’s driving dynamics philosophy. The vehicle sits on a sophisticated chassis equipped with adaptive suspension and rear-wheel steering, ensuring a ride quality that is both comfortable and agile. As a full-size luxury sedan, it competes with other high-end German rivals, offering a spacious interior, advanced technology, and a reputation for engineering excellence.
Despite its robust engineering, the N63 engine has known sensitivities that owners should be aware of. One common issue involves oil consumption, often due to weak piston ring designs or valve stem seals that harden over time. Using a high-quality synthetic oil like AMSOIL MS can help mitigate these issues by providing superior film strength and seal conditioning, potentially reducing the rate of oil burn-off. Another frequent concern with the N63 is the potential for carbon buildup on the intake valves and turbochargers, a problem exacerbated by direct injection and turbocharging. The use of fuel additives like AMSOIL P.i. can help keep injectors clean and reduce the accumulation of carbon deposits.
Thermal management is another area where the 750xi requires attention. The tight tolerances and high operating temperatures of the engine make it susceptible to cooling system degradation over time. Coolant leaks from plastic components and water pumps can become an issue as the vehicle ages. Regular flushing with a high-quality antifreeze like AMSOIL helps maintain corrosion inhibitors and prevents the degradation of hoses and seals. Additionally, the electronic cooling fan and water pump are known failure points. Proper fluid levels and cooling system health are critical to preventing the engine from running hot, which can lead to costly repairs. Finally, the transmission fluid can eventually break down under the heat generated by the powerful engine, leading to harsh shifts or delayed engagement. Changing the fluid regularly with a fluid designed for high-performance transmissions ensures the gearbox continues to operate smoothly for the long haul.