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Lucas extreme duty marine engine oil lowers oil temperatures, extends oil life, and minimizes metal fatigue. Designed for use in high performance boats requiring the ultimate protection, Lucas extreme duty marine engine oil is manufactured with the highest quality paraffinic base oils and is fortified with a formula containing high levels of zinc, moly, and phosphorus. The oil improves the film strength between the cylinder wall and piston rings and slows oil burning, while improving pressure levels in worn engines. It has good cold temperature properties, stands up to high operating temperatures, and is compatible with methanol and all racing fuels. Lubricate your marine engine for most severe conditions with tougher, thicker oil offering maximum protection--Lucas extreme duty marine engine oil.