What are the quality grades of diesel engine oil?

1 Answers
Makayla
07/30/25 12:32am
Diesel engine oil quality grades include: CA, CB, CC, CD, CE, CF, CF4, CG4, CH4, CI4, CJ4. The further back the letter is in the alphabet, the higher the oil quality grade, so the highest grade is CJ4. Currently in China, CF4 is the main grade for diesel engine oils. CF4 oil performs better than CF in terms of fuel consumption and piston deposit control, making it suitable for diesel engines using high-sulfur content diesel, high-speed direct injection diesel engines, and heavy-duty diesel engines. Moreover, the service life of CF4 is twice that of CD. When selecting engine oil for diesel vehicles, in addition to choosing the quality grade, the viscosity grade should not be overlooked. The appropriate viscosity can be selected based on factors such as local temperature conditions, the actual situation of the vehicle, and the viscosity recommended by the engine model.
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