Goodyear Dominor CF-4 is a heavy duty multi grade diesel engine oil developed for use in high speed diesel engines specifically for the on-highway and off-highway applications CF-4 oils are specifically compounded for use with diesel fuels ranging in sulfur content up to 0.5% weight. Developed to exceed the requirements of API CE, these oils are made using additives and base oils to provide extra oil economy and lowered piston deposits.