Stanadyne Performance Formula Warm Weather Blend - Case of 1/2 Gallon Jugs Case includes 6 Jugs. Each Jug Treats up to 250 Gallons of Diesel Fuel. The only Additive recommended by most O.E.M.s Product is Manufactured in the U.S.A. Product must be shipped Ground The same benefits as Stanadyne Performance Formula except the Cold Weather Protection.