Which is better for BMW, 5W30 or 0W40 engine oil?
2 Answers
BMW engines require 0W40 oil. BMW engines operate at relatively high temperatures, which demands high-temperature stability and protective properties from the oil, necessitating the use of a 40-grade oil. Here are more relevant details: 1. The meaning of engine oil model (specification): SAE (viscosity): The viscosity classification standard specified by the Society of Automotive Engineers. The number before "W" indicates the oil's low-temperature resistance index, while the number after "W-" indicates the oil's high-temperature resistance index. 2. How to find the right oil for your vehicle: Generally, the recommended oil type for your vehicle can be found in the user manual. Choosing the oil type specified in the manual is the optimal choice.
When it comes to BMW engine oil, I've used both 5W30 and 0W40 several times. Currently driving an older 3 Series, I feel the choice depends on individual driving conditions. BMW engines are quite precise, so the oil must be well-matched. 5W30 flows quickly during cold starts, warming up the engine faster, making it suitable for winter or northern regions; whereas 0W40 has stronger viscosity in high-temperature environments, offering better engine protection during high-speed driving, though it might slightly increase fuel consumption. The BMW official manual usually recommends 0W40 because it meets the LL-01 certification, catering to high-performance demands. However, if you mainly drive in the city under non-extreme conditions, 5W30 is sufficient—just ensure regular oil changes without delays. It's also crucial to choose reputable brands like Castrol or Shell to avoid counterfeit issues. Proper engine maintenance ensures a longer vehicle lifespan.
