Hamp Synergy OEM High Performance Honda Oil Filter H1540-RTA-515 (Pack of 10) Large Utilize the latest technology in oil filters. Anti-corrosive paint. Includes a relief valve to keep oil circulating when the element is stuffed, or when the engine was turned on in very low temperature. High performance filter element for catching dust and carbon particles. Anti-drain back valve which is made from heat-resistant silicone rubber. This allows oil to circulate quickly when the engine is started.