The transition to CL-4 oils is expected to be backward-compatible, but FB-4 use may depend on OEM approvals for specific engines and applications. Tanks and bottles of heavy-duty diesel engine oil ...

PC-12 has been fully approved by API and will replace CK-4 and FA-4 engine oils starting in 2027. The new engine oil category includes FB-4 for lower-viscosity oils and CL-4 for higher-viscosity ...

January 1, 2027, will be the first license date for two new heavy-duty engine oil categories, if all goes as planned. An update from the American Petroleum Institute said it has made significant ...

The new API FA-4 oil-service category was developed specifically to work in concert with the new generation of more fuel-efficient heavy-duty diesels starting to come on the market. Photo: Shell Oil ...

There are a multitude of factors that separate European- and American-spec engine oils, but if we were to pick one, it'd be emissions. Both the European Automobile Manufacturers' Association (ACEA) ...