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CK-4 & FA-4 Oils In 2017 there will be two new API Heavy Duty- Engine Oil Categories. CK-4 and FA-4 will be the standards to meet the new EPA and NHTSA emission legislation. These changes will result in improved fuel economy and a reduction in carbon dioxide. CK-4 and FA-4 oils will be introduced into the market on December 1st, 2016 and will eventually replace the CJ-4 category that has been the API industry standard for the past 10 years. Let’s take a closer look at the new…

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