Check Seal is specifically designed for use in internal combustion engines to improve performance, seal leaks and improve gas mileage. It is made with LIQUILON®, which plates metal surfaces to provide unmatched lubrication and protection to moving parts. Check Seal is compatible with petroleum base oils, and each application provides sealing and performance that is not available with any conventional motor oil or motor oil additive. After the initial application of Check Seal there will be noticeable improvements in performance and economy for new and older vehicles. Continued use of Check Seal will provide continued top performance to gasoline or diesel engines, even under extreme conditions.