What does GF-5 mean on the engine oil bottle?
1 Answers
GF-5 engine oil indicates that it is an SN-grade oil, which is the highest grade, and has received GF-5 certification. GF-5 certification is a synthetic oil certification by the American Petroleum Institute (API). Here are the evaluation standards of the American Petroleum Institute: 1. API (American Petroleum Institute) uses an engine oil quality rating standard, dividing lubricants into two categories: for gasoline engines (S) and for diesel engines (C). 2. Lubricants for gasoline engines are marked with an S followed by a letter (e.g., SE, SF, SH, SJ, SL, SM). The later the letter in the alphabet, the higher the quality of the lubricant. Currently, the highest grade, SN, is considered the top-tier engine oil.