Keeping your 2016 BMW 640i running with the precision and reliability you expect requires more than just following the maintenance schedule on the odometer. This vehicle houses the N55B30A engine, a sophisticated 3.0-liter twin-scroll turbocharged inline-six that delivers impressive power and performance. However, that same complexity and high-revving nature place significant thermal and mechanical stress on all lubricants within the powertrain. Standard conventional fluids often struggle to withstand the extreme heat generated by the turbocharger or the rapid shifting demands of the automatic transmission, potentially leading to premature wear or degraded performance. Choosing the right AMSOIL 0W-30 MS 100% Synthetic European Motor Oil ensures that every component, from the engine bearings to the transmission gears, receives maximum protection against wear, sludge, and temperature extremes.
Recommended AMSOIL Products
- AMSOIL 0W-30 MS 100% Synthetic European Motor Oil – Specifically engineered for the unique demands of European vehicles, this fluid offers superior thermal stability and engine cleanliness for the N55 engine.
- AMSOIL Oil Filter – Features 99% filtration efficiency at 20 microns to capture wear-causing contaminants and protect vital engine components.
- MANN-FILTERS Oil Filter – Offers premium media improvements over original equipment manufacturer (OEM)-branded filters.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides extended life and superior protection for the 8-speed transmission under heavy towing or severe driving conditions.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A ready-to-use ethylene glycol formula that protects against corrosion and boiling for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that greatly surpasses standards for metallic corrosion and erosion.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Offers an exceptional boiling point and stable viscosity to ensure responsive braking and ABS performance.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Offers robust protection with excellent cold-weather performance.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Provides a reliable alternative that guards against leaks and promotes smooth shifts.
Engine Oil and Filter Selection
The heart of your BMW 640i is the N55B30A engine, a 3.0-liter twin-turbo unit that operates at higher temperatures and pressures than standard naturally aspirated engines. Standard oils can thin out under these conditions, leading to increased engine wear. For this specific application, AMSOIL recommends the 0W-30 MS 100% Synthetic European Motor Oil. This synthetic formula is designed to meet the strict requirements of European manufacturers while providing benefits that exceed them. The precise blend of synthetic base oils and premium additives ensures the oil maintains its viscosity even when the turbocharger is spinning at thousands of revolutions per minute.
The oil capacity for a 2016 BMW 640i with a filter change is 6.9 quarts. Using the correct oil grade helps lubricate critical components like the variable valve timing (VANOS) system and turbocharger bearings effectively. It also helps keep the engine cleaner for longer, reducing the need for costly higher-octane fuels and preventing carbon buildup that can affect performance over time. Remember to replace the oil drain plug seal and torque the plug to 18 ft/lbs during service to ensure a secure fit.
When it comes to filtration, the AMSOIL Oil Filter is just as important as the oil itself. It is a highly efficient choice that allows lower restriction, keeping engine parts lubricated while capturing small contaminants that standard filters might miss. It offers greater capacity for wear-causing particles and extends service life, aligning perfectly with the extended drain intervals possible with synthetic oil. If you prefer the original equipment manufacturer (OEM) style, a MANN-FILTER Oil Filter is also available as an alternative, offering premium media improvements over standard branded filters. Both options ensure that your engine oil stays clean, maximizing the protection provided by the synthetic base fluid.
Transmission and Drivetrain Fluids
The 2016 BMW 640i is equipped with an 8-speed automatic transmission (GA8HP45Z) that relies on fluid that can handle rapid shifts and high torque loads. The total fill capacity for this transmission is 9 quarts. For the best performance, AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is the top recommendation. This fluid is formulated to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero temperatures. It provides reserve protection during heavy use, ensuring smooth, shudder-free shifts throughout the vehicle’s life.
If you are looking for a high-value option that still delivers exceptional protection, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is an excellent choice. It is specifically designed to protect against wear and harmful sludge while promoting smooth operation. For vehicles that do not require the specialized “Fuel-Efficient” designation, the AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid offers robust protection with excellent cold-weather performance and leak prevention. Similarly, the AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid provides a reliable alternative that guards against leaks and promotes smooth, shudder-free shifts.
Proper transmission fluid maintenance is crucial for preventing costly repairs. Using a fluid that degrades under heat can lead to slipping gears and rough shifts. AMSOIL synthetic fluids resist breakdown and maintain their viscosity better than conventional alternatives, ensuring the transmission operates smoothly regardless of the driving conditions you face.
Cooling System and Brake Fluid
Maintaining the correct AMSOIL Passenger Car & Light Truck Antifreeze & Coolant mixture is vital for the longevity of the 640i’s cooling system. The system holds 10.8 quarts of AMSOIL Propylene Glycol Antifreeze and Engine Coolant. AMSOIL offers two excellent options for this requirement: the Passenger Car & Light Truck Antifreeze & Coolant and the Propylene Glycol Antifreeze and Engine Coolant. The pre-mixed ethylene glycol formulation (AntPC) requires no mixing and protects against corrosion for up to 150,000 miles or 5 years. It is compatible with all other antifreeze colors and is free from phosphates, nitrates, and silicates, making it safe for all cooling system metals and hoses. The concentrated propylene glycol version is a more durable, eco-friendly option that greatly surpasses standards for metallic corrosion and erosion, extending protection to 150,000 miles or 5 years in passenger cars.
For the braking system, safety is paramount. The BMW recommends DOT 3 and DOT 4 fluids. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is designed to provide excellent ABS and traction-control responsiveness. It maintains a stable viscosity over a wide temperature range, preventing the fluid from boiling under heavy braking conditions, which can lead to pedal fade. This fluid ensures that your stopping power remains consistent and reliable, enhancing overall vehicle safety.
Additional Fluids and Maintenance
There are other essential fluids that contribute to the smooth operation of your BMW. The power steering system, particularly on models with active steering, benefits from the AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid. This fluid reduces friction, helps seals remain soft to prevent leaks, and offers strong anti-wear protection and excellent high-temperature performance. It is formulated for quiet operation, ensuring the steering system remains responsive and silent.
To further enhance the performance of your engine and fuel system, consider using AMSOIL P.i.® Performance Improver. This gasoline additive restores up to 14% of horsepower and helps clean GDI fuel injectors, improving fuel economy and preventing carbon buildup. Additionally, if you plan to store the vehicle during seasonal periods, AMSOIL Gasoline Stabilizer can keep fuel fresh for up to 12 months, protecting against varnish and gum buildup.
For vehicle care and protection, a range of additional products is available. AMSOIL Engine Fogging Oil is ideal for protecting internal components during storage. For general maintenance, the Heavy-Duty Metal Protector offers a long-lasting, wax-like coating that protects against salt, moisture, and chemical corrosion. The Silicone Spray provides a dry lubricating film that locks out moisture without attracting dust. For cleaning, the Heavy-Duty Degreaser effectively dissolves oil and grime, while the Power Foam® Carburetor and Induction-System Cleaner removes deposits that can restrict airflow. Finally, for exterior and interior care, the Miracle Wash Waterless Wash and Wax Spray and the Exterior Ceramic Spray provide protection against the elements, leaving your vehicle looking pristine.
About the Vehicle
The 2016 BMW 640i represents a peak in the F06 6 Series Gran Coupé line, blending the performance of a sports car with the practicality of a four-door coupe. Powered by the renowned N55B30A engine, this model features a 3.0-liter twin-scroll turbocharged inline-six that delivers robust power and a linear torque curve that characterizes BMW’s driving dynamics. Unlike the previous generation’s V8 or the naturally aspirated inline-sixes, the N55 engine offers a balance of responsiveness and efficiency, making it a favorite among driving enthusiasts who appreciate both speed and sophistication.
This vehicle sits comfortably in the luxury segment, competing with other high-performance coupes and gran coupés from European marques. Its design philosophy emphasizes a driver-centric cockpit, long hood, and a rear-wheel-drive bias that enhances handling dynamics. The 640i is not just about straight-line acceleration; it is engineered to handle winding roads with precision, thanks to its well-balanced chassis and advanced suspension systems. Owners typically value this vehicle for its ability to serve as a daily driver without sacrificing the “Ultimate Driving Machine” experience. Whether navigating city streets or cruising on highways, the 640i provides a refined and powerful presence, making it a standout choice in the luxury performance market.