The 2009 BMW 750i is a sophisticated grand tourer equipped with the N63B44A 0 Turbo 4.4L V8 engine. This powerplant is renowned for its smooth power delivery and high-performance characteristics, but it demands precision in maintenance, especially regarding lubrication. Synthetic motor oil is essential to ensure optimal flow through the complex engine passages and to protect critical components from the extreme thermal loads generated by the twin turbochargers. Regular fluid changes using the correct viscosities and capacities are vital to maintaining the vehicle’s legendary ride quality and longevity.
Recommended AMSOIL Products
- AMSOIL 0W-30 MS 100% Synthetic European Motor Oil – The premier choice for this BMW, specifically formulated for the thermal demands of the N63 turbo engine.
- WIX Oil Filter – Provides superior filtration media to remove contaminants and protect the engine’s sensitive bearings.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Delivers exceptional protection for the A6HP26Z 6-speed transmission under high stress.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A durable 50/50 pre-mix formulation that protects the cooling system up to 150,000 miles.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – Essential for the rear limited slip differential to prevent wear and control thermal runaway.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent ABS responsiveness and stable viscosity for safe stopping power.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and keeps seals soft to prevent leaks in the steering system.
- AMSOIL P.i.® Performance Improver Gasoline Additive – Restores up to 14% horsepower and cleans GDI fuel injectors to optimize engine efficiency.
Maintaining the 2009 BMW 750i requires attention to detail, particularly with the engine oil capacity and the specific type of filter used. For this vehicle, the engine oil capacity is 9.0 quarts with a filter change. If the oil cooler is also drained, an additional 1.1 liters (1.2 quarts) of AMSOIL 0W-30 MS European Motor Oil should be added to ensure the system is properly filled. The correct torque specification for the oil drain plug is 29 ft/lbs using an 18mm x 1.5mm thread. Failing to meet these precise specifications can lead to overfilling or underfilling, both of which can compromise the health of the turbocharged V8. The recommended AMSOIL 0W-30 MS European Motor Oil is designed to handle the unique demands of gasoline and turbocharged European vehicles, featuring a precise blend of synthetic base oils and premium additives that ensure superior protection in all conditions.
Complete Lubrication and Maintenance Guide
Beyond the engine, the transmission and cooling systems of the 750i require specialized fluids to handle the vehicle’s performance capabilities. The automatic transmission, specifically the A6HP26Z 6-speed unit, requires a full fill of 9.5 quarts. An initial fill capacity is 4.2 quarts, but the total capacity must be verified using a scan tool in accordance with manufacturer instructions. Using a high-quality synthetic automatic transmission fluid is crucial for preventing shudder and ensuring smooth shifts, especially when the vehicle is subjected to heavy towing or elevated temperatures.
The cooling system is another critical area where the 2009 750i benefits significantly from high-performance fluids. The coolant capacity is 14.3 quarts. AMSOIL offers two distinct options for this application. The Passenger Car & Light Truck Antifreeze & Coolant is a 50/50 pre-mixed ethylene glycol formulation that is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, making it safe for all cooling system metals and hoses. For those preferring a concentrated solution, the Propylene Glycol Antifreeze and Engine Coolant offers extended service life and superior protection against corrosion and erosion, with the option to mix with distilled water for custom viscosity control.
Differential and Gear Protection
The rear limited slip differential in the 750i is specified as a 225AL unit requiring GLS23 lubricant. This differential has a capacity of only 1.9 pints, making precise measurement important during service. AMSOIL SEVERE GEAR® 75W-140 is the ideal choice for this application. Its advanced formulation includes friction modifiers specifically designed for limited-slip differentials, which helps prevent chatter while controlling thermal runaway. The synthetic base stocks provide superior protection against rust and corrosion and help reduce operating temperatures, extending the life of the gears and seals.
Other Critical Fluids
Brake fluid replacement is another maintenance task that should not be overlooked. The BMW 750i is designed for a low-viscosity DOT 4 brake fluid. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides a stable viscosity over a wide temperature range, ensuring excellent responsiveness for both standard braking and advanced ABS traction control systems. For the power steering system, which may use combined power steering, hydraulic brake booster, and self-leveling suspension components depending on the specific model configuration, AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid is recommended. This fluid resists heat and reduces friction, helping seals remain soft to prevent leaks while ensuring quiet operation.
For fuel system maintenance, AMSOIL P.i.® Performance Improver is a potent additive that can restore up to 14% of horsepower lost to carbon buildup. It is particularly effective on Gasoline Direct Injection (GDI) engines, restoring injectors to 100% flow rate after a single tank of fuel. This helps improve fuel economy and reduces the need for higher-octane fuel, making it a valuable addition to the maintenance regimen of a high-performance vehicle like the 750i.
Vehicle Background
The 2009 BMW 750i represents a significant point in the history of the German luxury sedan market. Introduced as part of the F01 generation, the 750i was one of the first vehicles to feature the innovative N63 V8 engine. This 4.4-liter twin-turbocharged powerplant was a technological marvel for its time, replacing the naturally aspirated V8s and even the V10s that had previously powered the top-tier 7 Series models. The N63 engine was designed to deliver a massive amount of torque and horsepower while maintaining a relatively compact footprint, allowing engineers to achieve an almost perfect 50/50 weight distribution which is ideal for the vehicle’s dynamic handling.
Owners of the 2009 750i often cite the vehicle’s exceptional blend of comfort and performance as its defining characteristic. It is a full-size luxury sedan capable of ferrying four adults in plush, quiet surroundings while delivering acceleration figures that rival many sports cars. The interior is renowned for its high-quality materials, advanced technology for the 2009 model year, and a driving position that offers a clear view of the road. While the N63 engine introduced new challenges regarding oil consumption and maintenance intervals that required more frequent attention than older BMW engines, its performance pedigree remains highly respected. The 750i solidified BMW’s reputation for building cars that are not just comfortable transportation but engaging machines that reward skilled drivers with precise steering and composed handling. This combination of grand touring capability and sporty dynamics makes the 2009 750i a favorite among enthusiasts who value both luxury and pure driving pleasure.