AMSOIL’s CK-4 diesel products will not carry any OEM licenses at launch. They will be recommended for OEM specifications, but not be licensed.
Our new CK-4 products will not be API licensed. The API licensing system is a voluntary certification that sets minimum quality standards, which is important. Because it is a standard, licensing limits the flexibility needed to quickly adopt new technologies that can improve protection. Many diesel enthusiasts and people who depend on their diesel to make a living focus more on protection than on the API doughnut, AMSOIL included.
That is why we use specifications like CK-4 as the minimum and engineer protection into our products that goes beyond API standards. Due to the way the specifications are written, exceeding the standards prevents us from officially licensing our diesel products. We want to give you the most protection we can, and sometimes that requires opting out of a licensing program. AMSOIL has built an outstanding reputation on over 40 years of innovation, and our warranty secure program provides peace of mind that AMSOIL has your back. You can rest assured that your equipment is protected.
Learn what diesel oil AMSOIL recommends for your vehicle in the reference guide