Reduce noisy tappets and improve lifter performance with Liqui-Moly Tappet Stop Noise. Designed to dampen noise caused by worn out hydraulic lifters and tappets, Liqu-Moly Tappet Stop Noise helps to clean oil galleys in hydraulic lifters to promote proper operation while also cleaning valves, guides and bores without affecting engine oil viscosity. Liqui-Moly Engine Tappet Stop Noise can be used in all vehicles including petrol, diesel, and LPG. It is suitable to mix with all oil types including conventional mineral, semi-synthetic and full synthetic oils and wont damage engine gaskets, seals or bearings.