Diesel fuel specifications have undergone major revisions during the past decade. Actions taken to date do not satisfy the expressed requirements of the majority of diesel engine users and engine builders. Reference is made to the compatibility of current diesel fuel specifications with other middle distillate fuel specifications. Premium diesel fuels and fuel additivies are discussed. Constructive diesel fuel specification revisions are proposed which should satisfy the current needs of all diesel fuel consumers and diesel engine-builders and still be acceptable to the refiners and marketers of diesel and other related middle distillate fuels.