The new API oil performance upgrade for heavy-duty diesel engines is here. API CK-4 and FA-4 oils go way beyond their API CJ-4 counterparts, offering greater durability protection and potential for fuel efficiency benefits.

API CK-4 and API FA-4

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Click on the timeline image below to view the specification up to the first licensing date for API CK-4 and API FA-4 oils (December 1st, 2016)