5W-30 Semi-Synthetic is and ultra-high performance engine oil that utilizes premium base stocks and industry leading additives specifically for tow boats / inboards.
• Meets API Diesel Service classification up to CK-4.
• Meets the performance specifications for API Automotive Service classification up to SM.
• Suitable for fuels on any sulfur level.
• Premium base stocks and additive package ingredients place Sierra Heavy Duty at the leading edge of lubrication technology.
• Can be used in gasoline engines equipped with catalytic converters.
• Replaces Shell Rotella, Delo, and Indmar.