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What grade is ck oil?

This oil is grade 4 oil.

CK-4 engine oil has the advantages of strong lubricity and fuel saving. CK engine oil is a four-grade engine oil, and it is the first batch of products that have passed API CK-4 certification in the world. The fuel economy and oil change cycle of the product are emphasized, and the requirements of oxidation resistance, wear resistance and shear stability of the product are further improved, reaching more stringent Euro 5 and National 6 emission standards.