New Diesel Specifications CK-4 FA-4 Archives - AMSOIL Blog

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Diesel Engine Oil Specifications: Making Sense of CK-4 & FA-4

Diesel Engine Oil Specifications: Making Sense of CK-4 & FA-4

The API CK-4 and FA-4 diesel engine oil specifications are designed to help meet tight regulations while providing excellent wear...

July 7, 2021

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