Sea Foam 16 oz. TransTune Transmission Parts Cleaner. It safely cleans components without harming or swelling seals or altering the viscosity of the transmission fluid. Reduce rough or erratic shifting and eliminate damaging moisture. Suitable for automatic transmissions, power steering systems, and industrial or agricultural hydraulic systems. Made from 100% petroleum with 3 specific oils blended in, it effectively dissolves varnish that contaminates transmission valve bodies, bands, governors, pumps, and passages.