What Is a Valve Stem Seal?   A valve stem seal controls the amount of lubricating oil entering the valve guide while preventing excessive oil from entering the combustion chamber.   Applications   Suitable for:   * Gasoline Engines * Diesel Engines * Passenger Vehicles * Commercial...

What Is an Oil Seal? An oil seal is a mechanical sealing component used to prevent lubricating oil, grease, or other fluids from leaking while protecting machinery from dust, dirt, water, and contaminants.