Since being launched on Dec. 1, 2016, the American Petroleum Institute (API)—which ensures the newest categories of diesel oil for use in on- and off-highway vehicles and equipment are available in the marketplace—says it has licensed approximately 654 CK-4 and 83 FA-4 oils for the trucking, construction and agriculture industries.
API says the number of approved oils for both categories from large, medium, and small oil marketers has grown consistently throughout the year. API expects that the licenses for both oils will continue to increase and that FA-4 will see growth as more new engines that require lower viscosity engine oils are placed in service in the coming years.
API CK-4 oils succeeded CJ-4 engine oils and are backward compatible diesel oils. CK-4 provides improved shear stability, oxidation resistance, and aeration control over CJ-4 in the familiar SAE 15W-40 and 10W-30 viscosity grades. Lower viscosity FA-4 oils, which meet the same performance standards as CK-4 oils, have been developed to provide engine manufacturers with a tool that will help them meet more stringent fuel economy and greenhouse gas emissions requirements, API says.
Additonally, API says news CK-4 and FA-4 oils are available in bulk through diesel oil distributors for trucking, construction and agriculture operations and in packages through retailers. API recommends that shops, fleets and others purchasing diesel engine oils confirm that the oil is licensed for the CK-4 or FA-4 category, which means the maker is warrantying that it meets API standards. Those seeking to verify that an oil is licensed can contact the API directly or look on the API website, the organization says.