Oil Stop Leak Sealant Oil Leak-Stop regenerates rubber and plastic engine seals such as shaft seals and valve stem seals and prevents oil stains under the vehicle. Counteracts oil dilution. Reduces engine noise and oil consumption through piston. This product is compatible with any engine oil and suitable for any type of engine. Restores sealings and prevents leaks in elastomeric seals Reduces oil consumption Prevents blue, smoky exhaust fumes Stops oil stains under the vehicle