Engine Oil Stop Leak is an oil-soluble additive used to stop and prevent motor oil leaks through rubber seals. Properties: It stops and prevents oil leaks without engine disassembly. It restores elasticity of rubber seals of the crankshaft, camshaft, valve stems, etc. It is compatible with all oils. It does not damage catalysts. It does not impact the oil quality or viscosity. It can be used as a preventive measure, especially after long-term car downtime. Application: It is recommended for any engines. Instructions: Add to motor oil. 1 can (325 ml) is added to 3-6 liters of motor oil. It does not impact the oil change intervals.