Which is better, SN or SL engine oil?
2 Answers
From a performance perspective, SN-grade engine oil is better. Here is a detailed introduction to SN and SL engine oils: Differences: SN-grade engine oil primarily improves in terms of high-temperature detergency. In comparison, SL-grade engine oil does not have very high high-temperature detergency, and the SL grade does not have strict requirements on phosphorus content, only requiring it to be no higher than 0.1%. Turbocharged engines have very high requirements for engine oil, making SN-grade oil highly suitable. Cost-effectiveness: Currently, SN is the highest grade of engine oil. In terms of performance, SN-grade oil offers the best quality. However, in terms of price, higher-grade oils are more expensive, and SN is certainly more costly than SL. If budget is not a concern, car owners can opt for SN-grade engine oil.
Having driven for ten years, I've found that SN-grade engine oil is significantly better than SL overall. SL is an older standard, suitable for vintage cars or simple engines, but SN, as a newer version, offers superior protection—such as preventing carbon buildup and reducing wear—which is particularly crucial for modern vehicles. Even in my older car, switching to SN oil reduced engine noise and slightly improved fuel efficiency. When changing oil, I always check the manual's recommendations. For most new cars, opting for SN is the right choice due to its better compatibility and extended engine lifespan. Don’t sacrifice long-term benefits to save a little money; regular maintenance is key.
