Ensuring the longevity and optimal performance of your 2018 BMW 740E xDrive relies heavily on using the correct lubricants. This sophisticated plug-in hybrid features a 2.0L turbocharged four-cylinder engine (Engine Code B48A20M0) paired with an advanced eight-speed automatic transmission and all-wheel drive system. Because of the tight tolerances and high operating temperatures associated with the B48 engine and the xDrive drivetrain, standard off-the-shelf fluids may not provide the necessary protection. Proper maintenance involves selecting fluids that meet or exceed BMW’s specific standards for thermal stability, viscosity control, and additive protection.
Recommended AMSOIL Products
- AMSOIL 0W-20 LS 100% Synthetic European Motor Oil – Specifically engineered for the unique demands of European gasoline and hybrid vehicles, offering superior protection for the B48 turbo engine and extending service intervals.
- WIX Oil Filter – Provides premium filtration media that outperforms standard OEM filters, ensuring maximum oil flow and contaminant removal for your 2018 BMW.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – The top choice for the GA8P75HZ eight-speed transmission, delivering outstanding protection against wear, heat, and sludge while maintaining fluidity in extreme cold.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A high-performance OE-spec alternative that offers exceptional wear protection and fuel economy benefits for the automatic transmission.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Meets BMW P/N requirements and provides excellent ABS responsiveness, with a high boiling point to prevent brake fade under hard driving conditions.
Engine Oil and Filtration Essentials
The heart of your 2018 BMW 740E xDrive is the 2.0-liter B48 turbocharged four-cylinder engine. Unlike naturally aspirated engines, the turbocharger in this unit generates significant heat and places high stress on the lubricant. The factory recommendation specifies a 0W-20 viscosity, a thinner oil designed to flow quickly during cold starts and reduce internal friction. Using the AMSOIL 0W-20 LS 100% Synthetic European Motor Oil ensures that the oil maintains its viscosity index across a wide temperature range, providing a protective film for the turbo bearings and piston rings even under heavy load.
The oil capacity for this engine is 5.5 quarts when the filter is replaced. It is critical to adhere to this volume and to check the oil level immediately after the refill, as overfilling or underfilling can lead to foaming or inadequate lubrication. When changing the oil, always replace the drain plug seal and torque the plug to the specified 18 ft-lbs to prevent leaks. Complementing the synthetic oil is the WIX Oil Filter, which offers enhanced filtration capabilities compared to original equipment manufacturer (OEM) branded filters. This ensures that abrasive particles are captured before they can circulate through the engine’s critical components, extending the life of your powertrain.
Transmission and Drivetrain Protection
The 2018 BMW 740E xDrive utilizes an eight-speed automatic transmission (Code GA8P75HZ) that is integral to the vehicle’s smooth power delivery and fuel efficiency. This transmission operates under significant thermal stress, particularly when managing the combined torque of the electric motor and the combustion engine. For a total fill, the transmission requires 9.3 quarts of fluid. The AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is designed to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero temperatures.
For those seeking a high-quality alternative that aligns closely with OE specifications, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers excellent protection against wear. The xDrive all-wheel-drive system also relies on proper lubrication of the transfer case and differential. While specific fluid recommendations for the differential and transfer case were not listed with product codes in the current data, maintaining these components is essential for the longevity of the drivetrain. Ensuring the rear differential (1.9 pints) and front transfer case (1.3 pints) are serviced with appropriate high-performance gear lubes will prevent premature wear in these high-torque transfer points.
Cooling Systems and Brake Fluid
Maintaining the correct AMSOIL Passenger Car & Light Truck Antifreeze & Coolant mixture is vital for the B48 engine, which is sensitive to temperature fluctuations. The AMSOIL Propylene Glycol Antifreeze and Engine Coolant capacity varies depending on the specific equipment code of your vehicle. If your BMW is equipped with code S823A10, the high-temperature cooling circuit (HTCC) requires 10.6 quarts. For models with code S823A, the capacity is 9.6 quarts. Alternatively, if equipped with low-temperature cooling components (LTCC), the system holds 5.6 quarts. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is an ethylene glycol 50/50 pre-mix that is phosphate-, nitrate-, and silicate-free, making it compatible with all cooling system metals and hoses. It provides protection up to 150,000 miles or 5 years.
For drivers who prefer to mix their own concentrate, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers a robust alternative that greatly surpasses standards for metallic corrosion and erosion protection. Regarding the braking system, BMW specifies a DOT 4 fluid, and using a synthetic option ensures better performance. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is an excellent choice that offers excellent ABS and traction-control responsiveness. It provides a stable viscosity over a wide temperature range and helps prevent brake fade, a critical safety feature for a vehicle of this class.
Engineered for European Performance
The 2018 BMW 740E xDrive represents the pinnacle of the 7 Series lineup, combining luxury with cutting-edge hybrid technology. Built on the CLAR platform, the 7 Series is renowned for its smooth ride quality, spacious interior, and advanced technological features. The “E” in the model name denotes its plug-in hybrid nature, featuring an electric motor integrated with the 2.0-liter turbocharged B48 engine. This powertrain delivers a combined system output that provides brisk acceleration while maintaining respectable fuel economy for a vehicle of its size.
Owners of the 740E xDrive appreciate the seamless transition between electric and gasoline power, which is particularly beneficial in urban environments where electric-only operation is possible. The xDrive all-wheel-drive system further enhances the vehicle’s capability, providing superior traction in adverse weather conditions without sacrificing the driving dynamics BMW is famous for. The 7 Series is positioned as a flagship luxury sedan, competing directly with other high-end German sedans. Its market position is defined by its blend of comfort, safety, and innovation, making it a favorite among executives and those who value a driving experience that is both relaxing and engaging.
Common Challenges and Solutions
While the 2018 BMW 740E xDrive is a reliable vehicle, owners often encounter specific maintenance challenges common to modern European engineering. One frequent issue involves oil consumption, particularly in the early stages of the B48 engine’s life. The high operating temperatures and tight tolerances can lead to increased oil consumption over time. Switching to a high-performance synthetic like AMSOIL 0W-20 LS can help mitigate this issue by providing superior oil film strength and reduced evaporation rates, ensuring the engine retains the correct oil level for longer periods.
Another potential concern is the buildup of carbon deposits in the intake ports and on the fuel injectors, especially given the direct injection nature of the B48 engine. Carbon buildup can lead to rough idling, reduced fuel economy, and pre-ignition knock. Using the AMSOIL P.i. Performance Improver Gasoline Additive regularly can help restore fuel injectors to 100% flow rate and clean GDI injectors, significantly improving engine performance and efficiency. Additionally, the complex cooling systems in these vehicles can suffer from corrosion or seal degradation over time. High-quality synthetic coolants like the AMSOIL Passenger Car & Light Truck Antifreeze & Coolant are phosphate- and silicate-free, reducing the risk of clogging the radiator or heater core and extending the life of cooling system components.
Finally, the electronic components and sensors in the 740E xDrive, particularly the high-voltage hybrid system and battery management systems, require precise temperature control. Overheating or freezing can lead to costly repairs. Maintaining the cooling system with the correct fluid and volume is not just about engine health but also about protecting sensitive electronics. By adhering to the recommended fluid capacities and using premium lubricants, owners can effectively manage these risks and ensure their vehicle remains a joy to drive for years to come.
In summary, the 2018 BMW 740E xDrive is a remarkable vehicle that demands top-tier maintenance. From the engine oil that protects the turbocharger to the transmission fluid that ensures smooth shifting, every fluid plays a critical role in the vehicle’s performance. By choosing AMSOIL products, owners can provide their BMW with the highest level of protection available, ensuring reliability and performance regardless of driving conditions.