Stanadyne Performance Formula Diesel Fuel Additive - 16 Oz. Case of 12 Approved by many OEMs including GM, Ford, Deere & Navistar Proven to perform best in independent testing The premium, all-season, all purpose diesel fuel additive, designed to tackle virtually any diesel fuel related problem. Meets Cummins L10 Superior Test for cleanliness Made by a fuel injection equipment manufacturer