Look at the standards and content;

1. Classification by type of use: including industrial oil, vehicle oil, marine oil, special oil, grease, antifreeze, etc. .

2. By brand: first-tier international famous brands (Mobil, Shell, etc.), first-tier domestic famous brands (Great Wall, Kunlun, etc.)

Second-tier famous brands, regional brands and industry brands, Other international and domestic regular brands. Marginal brands (that is, imitating brands in terms of trademarks, product names, packaging, etc.). Small oil fake oil. But not all well-known brands are the best and most suitable. And there are a lot of fakes from well-known brands.

3. Classification by API and SAE.

4. Classification by packaging: small packaging, bulk oil.

..........