What does SP's A3/B4 mean?

1 Answers
DeElliot
07/29/25 4:13pm
Engine oil SP represents the quality grade of engine oil. SG, SJ, SL, SM, and the subsequent SP are all grades for gasoline engine oils, with SP being the highest grade currently available for gasoline engine oils. A3/B4 is the testing and certification standard for automotive lubricants set by the European automobile manufacturing industry. Technically, it is higher than the commonly known American API standard. Below is an introduction to related content: 1. A represents gasoline engine oils, including A1, A3, A5, etc., while B represents light-duty diesel engine oils, including B1, B3, B4, B5, etc. The higher the number, the higher the grade. 2. A3/B4 is a dual-purpose oil for both gasoline engines and light-duty diesel engines, with a relatively high grade.
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