Keeping your 2018 BMW i3 running smoothly requires the right lubricants tailored to its unique electric and range-extender powertrain. This vehicle, equipped with a 0.6L 2-cylinder range extender engine (Engine Code W20K06A J), places specific demands on motor oil, coolant, and brake fluids. Using the correct products ensures maximum protection against wear, extends component life, and maintains the vehicle’s efficiency and driving dynamics.
Recommended AMSOIL Products
- AMSOIL 0W-30 MS 100% Synthetic European Motor Oil – Specifically designed for the unique demands of European vehicles, this oil features a precise blend of synthetic base oils and premium additives to protect the small-displacement engine in the i3.
- WIX Oil Filter – Offers premium filtration media that improves upon original equipment manufacturer standards, ensuring clean oil circulation for the range extender engine.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed formulation that protects the cooling system metals and hoses, engineered to exceed OEM requirements for extended service intervals.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with stable viscosity across a wide temperature range, ideal for the precise braking systems found in the i3.
The engine in the 2018 BMW i3 range extender model is a compact 0.6L two-cylinder unit. Despite its small size, this engine operates under significant thermal and mechanical stress, often running more frequently and at higher RPMs to charge the battery when range is low. Standard mineral oils or generic synthetic blends may not provide the necessary film strength or thermal stability required to protect the bearings and cylinders in this specific configuration. AMSOIL 0W-30 MS 100% Synthetic European Motor Oil is engineered to meet the strict specifications required by BMW, ensuring that the oil maintains its viscosity and cleaning properties even under the heat generated by the electric drivetrain’s demands and the range extender’s operation.
The cooling system in the i3 is equally critical. The vehicle utilizes a complex thermal management system to regulate the battery temperature, the motor heat, and the range extender engine simultaneously. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant uses a unique poly-organic acid (OAT) formulation that is compatible with the various metals and gaskets found in BMW cooling systems. This fluid protects against corrosion and cavitation, which can be a concern in older vehicles or those with high mileage. The capacity for the coolant system varies depending on the specific configuration, with some systems holding approximately 8.5 to 8.7 quarts, requiring a large quantity of high-quality fluid to ensure proper heat transfer and freeze protection.
Brake System and Fluid Requirements
Even though the BMW i3 is a lightweight electric vehicle with regenerative braking, the hydraulic brake system remains vital for safety, especially in emergency stops or low-speed maneuvers. The brake fluid must resist moisture absorption, which lowers the boiling point and can lead to brake fade or corrosion in the lines. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is formulated to resist moisture uptake and maintains a stable viscosity from cold starts to high-temperature stops. This fluid is compatible with BMW’s specific brake fluid requirements, including specifications for low-viscosity fluids that ensure rapid response in the ABS and traction control systems.
Maintaining the filter is just as important as the fluid itself. The WIX Oil Filter recommended for this vehicle is designed to capture contaminants that can accelerate wear. The oil capacity for the 0.6L engine is approximately 2.7 quarts when including the filter change. It is crucial to adhere to the torque specifications during maintenance, with the oil drain plug requiring a torque of 21 ft/lbs. Proper installation ensures there are no leaks and the filter is seated correctly to prevent bypassing unfiltered oil.
Additional Fluids for Long-Term Performance
Beyond the engine oil and coolant, the 2018 i3 benefits from attention to other fluid systems. While there are no specific transmission fluid recommendations for the electric drive unit in the provided source data, the brake fluid is a consumable that should be checked regularly. For those storing their vehicle, AMSOIL Gasoline Stabilizer can be used in the range extender tank to keep the fuel fresh for up to 12 months, preventing varnish and gum buildup that can clog injectors. Additionally, AMSOIL P.i.® Performance Improver is a potent fuel additive that can restore up to 14% of horsepower and clean fuel injectors to 100% flow rate, which is particularly beneficial for the small gasoline engine that serves as a backup power source.
Vehicle Background
The 2018 BMW i3 is a fascinating anomaly in the automotive world, representing a shift toward sustainable mobility and innovative engineering. Introduced as BMW’s first fully electric vehicle platform, the i3 was designed from the ground up to be lightweight, efficient, and unique. The vehicle’s cabin is constructed largely from carbon-fiber-reinforced plastic (CFRP) and natural fibers like flax, giving it a distinct structural rigidity while keeping weight low. This design choice was revolutionary for the time, allowing for a vehicle that handles with the agility of a sports car despite its electric powertrain.
For 2018, the model came in various configurations, including a fully electric version and a Range Extender variant equipped with the 0.6L two-cylinder gasoline engine discussed in this article. The Range Extender model was designed to alleviate “range anxiety,” allowing the small engine to generate electricity for the battery when the charge was depleted, effectively turning the i3 into a series hybrid. This dual-powertrain setup made the i3 a versatile urban commuter vehicle that could handle longer trips without significant charging stops. The vehicle’s market position was unique, targeting eco-conscious drivers who did not want to compromise on BMW’s reputation for build quality and driving dynamics.
Despite its innovative design, the 2018 BMW i3 does have a few known issues that owners should be aware of. One common problem involves the range extender engine itself, which can sometimes suffer from carbon buildup or fouling if it is used infrequently or only for short bursts. The use of high-quality synthetic motor oils like AMSOIL 0W-30 MS 100% Synthetic European Motor Oil can help mitigate this by keeping the small engine cleaner and reducing the formation of deposits. Another issue reported by owners relates to the high-voltage battery degradation over time, which can be exacerbated by extreme temperatures. Maintaining a healthy cooling system with AMSOIL Antifreeze & Coolant is essential to ensuring the battery packs operate within their optimal temperature range, preserving their lifespan.
A third common concern for i3 owners is the wear on the brake components, particularly due to the regenerative braking system’s reliance on the hydraulic brakes for final stops. When the regenerative system is inactive or during hard stops, the friction brakes engage more frequently, leading to faster wear on pads and rotors. Using a high-performance brake fluid like AMSOIL DOT 3 and DOT 4 Synthetic Brake Fluid helps protect the hydraulic lines and calipers from corrosion, ensuring the system responds quickly and reliably. Finally, some owners have reported issues with the door handles or interior plastics becoming brittle over time due to UV exposure or chemical reactions. While not a mechanical issue, protecting the vehicle’s exterior and interior with proper care products can help maintain the unique materials used in the i3’s construction.
Ultimately, the 2018 BMW i3 is a vehicle that rewards meticulous care. Its blend of cutting-edge materials, electric efficiency, and range-extending capability makes it a favorite among those who value innovation. By using the correct lubricants and fluids, owners can ensure that their i3 continues to perform as intended, providing a smooth and efficient driving experience for years to come.