Bar s Leaks® High Mileage Automatic Transmission Repair is designed to improve performance in high-mileage vehicles by reducing rough shifting friction and slipping. It also helps control temperature and fixes issues like shuddering chatter and whining. This formula ensures smoother operation and helps extend the life of your transmission saving you from expensive repairs. Note that it is not suitable for CVT systems. It works with synthetic transmission fluid and is a universal solution for most vehicles.