Ensuring your 2021 BMW M240I receives the correct lubrication is essential for maintaining the performance of its B58B30M0 2 turbocharged engine. This high-output vehicle places significant demands on its fluids, particularly regarding thermal stability and shear resistance. Using the right motor oil, transmission fluid, and filters helps preserve the intricate engineering of the turbocharger and ensures reliable operation under extreme conditions.
Recommended AMSOIL Products
- AMSOIL 0W-20 LS 100% Synthetic European Motor Oil – A specialized European formula designed to meet the precise requirements of the B58 engine, offering exceptional wear protection and thermal stability for all temperatures.
- WIX Oil Filter WL10342 – Features premium media that improves upon original equipment manufacturer standards, ensuring optimal filtration of contaminants and extended drain intervals.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides superior protection for the 8HP50 transmission, maintaining fluidity in sub-zero temperatures while withstanding the heat of aggressive driving and towing.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Offers excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range, ideal for the high-performance braking systems found in the M240i.
When it comes to cooling the engine, the 2021 BMW M240i utilizes a complex cooling system that requires precise fluid chemistry. The capacity for coolant varies depending on the specific configuration, with some models requiring 9.8 quarts for the HTCC (High Temperature Cooling Circuit) and others requiring 11.1 quarts for the AT11 system. A 4.1-quart capacity applies to the LTCC configuration. For these systems, AMSOIL Passenger Car & Light Truck Antifreeze & Coolant offers a unique poly-organic acid formulation that protects against corrosion and is compatible with all other coolant colors. Alternatively, for those who prefer a concentrated formula, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant provides protection up to 150,000 miles or five years when mixed with distilled water.
The automatic transmission in this vehicle, specifically the 8-speed 8HP50, benefits greatly from using a dedicated synthetic fluid. The total fill capacity for a complete flush is approximately 9.3 quarts. Regular maintenance with the Signature Series Fuel-Efficient Automatic Transmission Fluid helps prevent sludge buildup and ensures smooth shifting, even during hard acceleration. Furthermore, the braking system requires attention to maintain its stopping power. The BMW specifies a low viscosity DOT 4 fluid, which is best met by AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid.
For the fuel system, the turbocharged nature of the B58 engine means that carbon buildup can become a concern over time. To combat this, the AMSOIL P.i.® Performance Improver Gasoline Additive is highly effective. It helps restore fuel injectors to 100% flow rate and improves fuel economy, which is a significant benefit for drivers looking to maintain peak performance. For seasonal storage, the AMSOIL Gasoline Stabilizer keeps fuel fresh for up to 12 months, protecting against ethanol corrosion and varnish buildup.
About the Vehicle
The 2021 BMW M240i represents a pinnacle of engineering within the compact sports coupe segment. Powered by the B58 engine, this 3.0-liter inline-six features a twin-scroll turbocharger that delivers a thrilling balance of power and efficiency. The vehicle is built on the sophisticated CLAR platform, which provides a perfect 50/50 weight distribution and a low center of gravity. This architectural choice significantly enhances handling, allowing the M240i to carve through corners with precision that rivals vehicles from the dedicated M division.
Owners often cite the M240i’s dual character as their favorite attribute. It is aggressive and sporty enough for track days yet comfortable enough for daily commuting. The ZF 8HP automatic transmission pairs seamlessly with the engine, providing rapid, smooth shifts that maximize the available torque. The steering is direct and responsive, giving the driver a strong connection to the road. Interior quality matches the exterior performance, with premium materials and a driver-focused cockpit that includes advanced technology features.
However, high-performance vehicles like the M240i are not without their specific maintenance challenges. The B58 engine, while robust, can experience oil consumption issues in some units, particularly those driven with high spirited aggression. Using a high-quality synthetic oil like the AMSOIL 0W-20 LS 100% Synthetic European Motor Oil can help mitigate this by providing a superior film strength that reduces oil burn-off. Another common issue in turbocharged engines is carbon buildup on the intake valves, as direct injection systems do not allow fuel to wash the valves clean. The use of AMSOIL P.i.® Performance Improver in the fuel system is a proactive step to keep injectors clean and restore lost horsepower.
Additionally, the 8-speed automatic transmission can develop shifting issues if the fluid degrades or becomes contaminated with metal shavings from normal wear. Regular fluid changes with the Signature Series Fuel-Efficient Automatic Transmission Fluid ensure the transmission operates at peak efficiency. Finally, brake fade can occur during repeated hard stops; upgrading to a high-temperature synthetic brake fluid helps maintain pedal feel and stopping power under stress.
Maintaining your 2021 BMW M240i with premium synthetic fluids ensures that every component, from the turbocharger to the transmission, operates within its optimal parameters. By choosing the right products, you are investing in the longevity and performance of this remarkable machine, allowing you to enjoy the full potential of the B58 engine for years to come.
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