Champion COS3600 Engine Oil Filter Replacement Rigid Core Structure: The steel center tube wont fold under pressure Synthetic-Blend Media Optimized Pleat Count: For 99% filtration efficiency Silicone Seal: Prevents oil loss through oil filter inlet holes when engine is shut off Made of Premium Components: Ensures clean oil for cold engine start up Nitrile Gasket: Provides proper seating to engine and prevents leaks