Sierra oil filters are engineered with premium grade materials that will not onlywithstand but excel in the extreme environment of the Marine world. Sierraensures the excellent performance of their filters by: Epoxy coating all canisters for corrosion resistance Using a heavy-wall steel canister for further corrosion protection Using high-efficiency filter media that meets or exceeds the OE's filtration Backed by Sierra's industry leading warranty Replaces Volvo: 478736