Supertech Nissan 5.5mm Valve Stem Seal - Single

These Supertech valve stem seals are made with a 5.5mm stem diameter, a specific size designed to fit certain Nissan engines. Their main job is to keep oil from leaking down the valve guides and into the combustion chamber, which helps prevent blue smoke on startup and keeps your engine running cleaner. When you're rebuilding an engine or just replacing worn-out seals, getting the right size is crucial for a good seal and proper engine function.

The material used in these seals is chosen for its ability to withstand the heat and oil present around the valve stem. A well-functioning valve seal is key to maintaining good compression and preventing excessive oil consumption. If you're noticing oil burning or blue smoke, especially after the engine has been sitting, replacing these seals is a common and effective fix.