Which is better, SL or SN engine oil?
2 Answers
SN engine oil is better than SL. Relevant details are as follows: 1. Reason: In China, engine oils are classified according to the API standard. Currently, SN is the highest grade of engine oil. From SA to SN, the later the letter after S, the higher the grade. Compared to SL grade, SN grade has a wider temperature adaptation range and better protection capabilities. Currently, most fully synthetic engine oils on the market are of SN grade. There are even better GT engine oils of SN grade. 2. Use: The engine is the heart of a car. Inside the engine, there are many metal surfaces that move and rub against each other. These components operate at high speeds, in harsh environments, and can reach working temperatures of 400°C to 600°C. Under such severe conditions, only qualified lubricating oil can reduce wear on engine parts and extend their service life.
I just finished researching motor oil specifications, and the difference between SL and SN is huge! The SN grade is newer and offers significantly better protection, especially for turbocharged vehicles. Take my own car for example – since switching to SN oil, the engine noise during cold starts has noticeably reduced. The key environmental benefit is SN's stricter phosphorus content control, which prevents premature aging of the catalytic converter. When you see SP-grade oil at gas stations now, don't hesitate – it's the upgraded version of SN. As for pricing, SN is more expensive but justifiably so – it contains more detergent dispersants that reduce sludge buildup, making it absolutely the right choice for owners who frequently make short trips.
