Trans Last Atf Conditioner.This fully formulated automatic transmission fluid conditioner can be added to new or in-use automatic transmission fluids, and is ideal for use in passenger cars, light trucks, and heavy-duty use including SUVs and 4x4s, large applications including box trucks, RVs, and busses, towing applications, high-performance or older vehicles, and vehicles with or likely to have extended lives. Add 1 pint of Trans Last for standard-sized automatic transmission. For larger capacity systems, Trans Last should be used at a rate of 16 ounces per 8 quarts of transmission fluid.