Sierra 18-7974 Oil Filter Sierra high-quality replacement oil filters are designed to meet or exceed OEM specifications. Sierra oil filters are designed to be direct-replacement filters, making installation easy. Engineered with premium grade materials that will excel in the extreme marine environment Epoxy coated for corrosion resistance Heavy-wall steel canister for further corrosion protection High-efficiency filter media that meets or exceeds the OEs filtration Backed by Sierras industry lea