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Specifically formulated for the heavy duty inboard marine market, including cruisers and towboats calling for a 15W-40. Premium base stocks and additive package ingredients places Sierra Heavy Duty at the leading edge of lubrication technology. Meets API Service classification up to CK-4Meets the performance specifications for API service classification SMSuitable for fuels on any sulfur levelNot for use in gasoline engines equipped with catalytic convertersReplaces: Shell Rotella T4, Delo 400, MerCruiser, Indmar, Pleasurecraft, Crusader, Volvo Penta, MasterCraft Sold in case pack only.