Lucas Marine SAE 20W-50 Racing Oil is manufactured with the highest quality paraffinic base oils and is fortified with a unique additive package containing high levels of zinc, molybdenum and phosphorus, which provides a tougher, thicker additive film for maximum protection even under the most severe conditions. It lowers oil temperatures, extends oil life and minimizes metal fatigue. It improves the film strength between the cylinder wall and piston rings and slows oil burning and improves pressure in worn engines. It has good cold temperature properties and stands up to high operating temperatures. Lucas Marine SAE 20W-50 is compatible with methanol and all racing fuels. It is compatible with synthetic and non-synthetic oils. Lucas Marine SAE 20W-50 Racing Oil is designed for use in high performance boats requiring the ultimate protection. If you need extra thermal protection and want to extend the life of your oil, try our Marine Semi-Synthetic SAE 20W-50 Racing Oil. Not recommended for passenger car use.