Sierra 18-7824-2 Oil Filter for Sterndrive and Inboard Engines Sierra oil filters are highly recommended replacement oil filters for sterndrive and inboard engines. Sierra oil filters, including the Sierra 18-7824-2, are engineered with premium grade materials that will not only withstand but excel in the extreme environment of the marine world. The painted canister features heavy walls and an epoxy coat for added corrosion resistance. All replacement Sierra oil filters are manufactured to meet