Ensuring your 2008 BMW 750i receives the correct maintenance is essential for maintaining its performance and extending its service life. This luxury sedan, powered by the robust 4.8L N62 B48 D V8 engine, was engineered to deliver smooth, powerful acceleration and refined handling. However, like any high-performance vehicle, the 750i relies heavily on the quality of its lubricants. Using the wrong viscosity or inferior oil can lead to premature wear, particularly in critical components like the valvetrain and pistons which are subject to high thermal loads. Proper fluid selection also protects the complex transmission and differential systems from heat and friction, ensuring that the driving experience remains smooth and responsive.
Recommended AMSOIL Products
- AMSOIL 0W-30 MS 100% Synthetic European Motor Oil – This European-formula oil is designed specifically for the precise tolerances of BMW engines, offering superior protection against wear in both hot and cold temperatures.
- MANN-FILTERS Oil Filter – Featuring premium filtration media, this filter provides better flow and efficiency than standard OEM filters to ensure clean oil reaches all engine components.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed ethylene glycol formulation that protects the cooling system against rust and corrosion for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated coolant option that requires mixing, offering extended protection and corrosion resistance for heavy-duty performance.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Engineered to withstand the rigors of heavy towing and elevated temperatures while maintaining fluidity in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective synthetic fluid that provides excellent protection against wear and sludge formation for the A6HP26Z transmission.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – Ideal for the limited-slip differential, this lube contains friction modifiers to prevent chatter and controls thermal runaway.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS responsiveness and stable viscosity over a wide temperature range, meeting the high standards of European brake systems.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and protects seals to prevent leaks, ensuring quiet operation and long fluid life in power steering systems.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – A versatile high-performance fluid designed to withstand abusive driving conditions and provide reserve protection.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Promotes smooth, shudder-free shifts and guards against leaks in a variety of transmission applications.
Engine Oil and Filtration
The heart of your 2008 BMW 750i is the N62 B48 D engine. This naturally aspirated 4.8-liter V8 is known for its power and smoothness, but it requires precise lubrication to handle the stresses of high-revolution driving and extreme temperatures. The recommended oil grade is 0W-30 or 5W-30, with a total capacity of 8.5 quarts when the filter is changed. After refilling, it is crucial to check the oil level to ensure it is within the correct operating range. AMSOIL 0W-30 MS 100% Synthetic European Motor Oil is engineered specifically for these European vehicles. Its unique blend of synthetic base oils and premium additives creates a robust film strength that protects critical engine parts even under severe service conditions. This oil resists thermal breakdown and oxidation better than conventional oils, ensuring that your engine stays cleaner and runs more efficiently.
Alongside the oil, the oil filter plays a vital role in protecting the engine. The MANN-FILTERS Oil Filter (HU823X-EA) is a recommended choice for this application. It uses premium filtration media that offers improvements over original equipment manufacturer-branded filters, capturing microscopic contaminants that can cause wear. This ensures that the cleanest possible oil circulates through the engine, maximizing the lifespan of internal components.
Transmission and Differential Protection
The automatic transmission in the 2008 BMW 750i, identified as the A6HP26Z, requires specific attention to maintain its smooth shifting characteristics. The total fill capacity for a complete service is 9.5 quarts, while an initial fill for a dry transmission requires 4.2 quarts. Using a high-quality synthetic transmission fluid is essential for this complex gearbox. AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid provides outstanding protection against wear, sludge, and elevated temperatures. It remains fluid even in sub-zero conditions, ensuring quick shifts and optimal performance. For those seeking a high-performance option, the Signature Series is an excellent choice, while the OE Fuel-Efficient variant offers a reliable, cost-effective solution that also protects against wear and promotes smooth shifting.
The differential system is another critical component that benefits from synthetic lubrication. The rear limited-slip differential, whether it is the 215M or 230K type, requires a specific gear lube to function correctly. AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube is designed for these applications. It contains friction modifiers that prevent the chattering often associated with limited-slip differentials. Furthermore, this gear lube helps control operating temperatures and protects against rust and corrosion, extending the life of the gears and bearings.
Other Essential Fluids
Maintaining the braking and suspension systems is equally important for safety and comfort. The 2008 BMW 750i utilizes a brake fluid system that requires a low viscosity DOT 4 fluid. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid exceeds OEM requirements and provides excellent responsiveness for ABS and traction control systems. It maintains stable viscosity across a wide temperature range, ensuring reliable braking performance whether you are driving in freezing winter conditions or under the heat of summer traffic.
For vehicles equipped with power steering, whether they feature All-Speed/All-Road Suspension or a standard setup, the correct fluid is necessary to prevent seal damage and ensure quiet operation. AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid resists heat for long fluid life and includes strong anti-wear protection. It helps seals remain soft to prevent leaks and reduces friction, allowing for smoother steering input. The fluid is formulated for quiet operation, which aligns perfectly with the luxury character of the 750i.
Coolant is another fluid that often gets overlooked until a problem arises. The 2008 BMW 750i holds 15.3 quarts of coolant. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is an ethylene glycol-based, pre-mixed solution that protects all cooling system metals, gaskets, and hoses. It is free of phosphates, nitrates, and other additives that can be harmful to modern cooling systems, offering protection for up to 150,000 miles or 5 years. For those who prefer a concentrated option, AMSOIL Propylene Glycol Antifreeze and Engine Coolant provides extended protection and is compatible with all other antifreeze colors.
About the Vehicle
The 2008 BMW 750i represents a pinnacle of German engineering during the late 2000s. As part of the E65/E66 generation, this sedan was designed to compete with other luxury vehicles in its class by offering a blend of sporty performance and opulent comfort. Under the hood lies the N62 V8 engine, a naturally aspirated powerplant that was renowned for its linear power delivery and smooth operation. The 4.8-liter displacement provided ample torque and horsepower, allowing the heavy sedan to accelerate with ease while maintaining a refined driving character.
Owners of the 750i typically appreciate its rear-wheel-drive platform, which offers a balanced and engaging driving experience. The vehicle features a luxurious interior with high-quality materials, advanced technology for its time, and a suspension system tuned for both comfort and handling. The 750i was often chosen by drivers who valued performance and prestige over the more common front-wheel-drive luxury competitors. While it was a high-mileage vehicle designed for long-distance cruising, the robust construction of the chassis and the quality of the N62 engine meant that with proper maintenance, these vehicles could serve their owners well for many years. The combination of the powerful V8 and the sophisticated chassis makes the 2008 750i a distinctive and capable vehicle in the luxury sedan segment.