What is the Difference Between SN and SL Grade Engine Oil?
2 Answers
Engine oil SN grade and SL grade differ in that: SN has a higher oil grade than SL. The detailed differences between SN and SL grade engine oils are as follows: 1. Different quality grades. 2. Different phosphorus content requirements. More information about engine oil is as follows: 1. It can lubricate and reduce wear, assist in cooling, seal against leaks, prevent rust and corrosion, and cushion shocks for the engine. 2. Engine oil is known as the 'blood' of a car. 3. Engine oil consists of base oil and additives. The base oil is the main component of lubricating oil, determining its basic properties, while additives can compensate for and improve the shortcomings of the base oil's performance, giving it certain new properties, making them an important part of lubricating oil.
From my experience as a longtime car enthusiast, there's a significant difference between SN-grade and SL-grade engine oils. I've used many oils, and SN is a new standard introduced after 2010, far superior to the outdated SL grade. SL, a 2001 specification, has poorer wear resistance, especially with long-term use leading to increased engine carbon buildup and louder noises during acceleration. SN incorporates better formulations that protect modern emission systems and reduce low-speed pre-ignition risks, which is crucial for turbocharged models. When changing oil, I always check the API label on the bottle—SN grade also helps improve fuel efficiency and delivers a smoother ride. While SL might be acceptable occasionally for older cars, newer vehicles are better off with SN to extend engine life and reduce trips to the repair shop. Checking the oil grade during changes can prevent many issues, and I recommend not skimping on that little extra cost.
