Engine Oils
Understanding API Oil Ratings: SL, SN, SP and What They Mean
API ratings define the performance level of engine oils. Learn what each classification means and how to choose the right oil for your engine.
API (American Petroleum Institute) ratings are the industry standard for classifying engine oil performance. Understanding these ratings helps you choose the right lubricant for your vehicle.
What Are API Ratings?
API ratings are two-letter codes that indicate the performance level and intended use of an engine oil. The first letter indicates the engine type — "S" for spark-ignition (petrol) engines and "C" for compression-ignition (diesel) engines.
Petrol Engine Ratings
API SL — Introduced in 2001. Designed for 2001 and older vehicles. Provides good protection against deposits, oxidation, and wear.
API SN — Introduced in 2010. Improved protection for modern engines with better control of high-temperature deposits and improved fuel economy.
API SP — The current standard, introduced in 2020. Provides the highest level of protection including timing chain wear protection and improved oxidation resistance.
Choosing the Right Rating
Always use the rating recommended by your vehicle manufacturer. Using a higher-rated oil is generally acceptable, but never use a lower-rated oil than specified.
MB Lubricants' HI-LUBE range covers all three ratings — SL, SN, and SP — ensuring the right protection for every petrol engine.