Lucas Transmission Fix contains no solvents or anything else that would be harmful to an automatic transmission. It is a thermal stable blend of petroleum-extracted additives designed to correct existing problems and prevent new ones in automatic transmissions. Lucas Transmission Fix stops slip, hesitation and rough shifting in worn transmissions. It completely eliminates most seal leaks and lowers operating temperatures in hard working units. A must for motor homes and commercial vehicles. Lucas Transmission Fix is excellent for preventative maintenance and will extend fluid life up to four times longer. It also extends needed protection to planetary gears. One 24 oz. bottle of Lucas Transmission Fix can be added to existing fluid without draining. A second bottle may be necessary in large or badly worn transmissions. In smaller transmissions (compact or sub-compact vehicles), use 12 oz. Lucas Transmission Fix is also excellent for light duty manual transmissions using automatic transmission fluid or motor oil as a lubricant. For easier shifting and extended transmission life drain transmission, install one 24-ounce bottle of Lucas Transmission Fix and top off with A.T.F. or motor oil.