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Valvoline VR-1 racing oil has higher zinc content. 20W50 is found at most parts stores, and is only a little more expensive than regular oil. Its detergent content is said to be lower than regular oil. Now that the overhaul is well broken in, I may start using 2 quarts of VR-1 and 3 quarts of regular high detergent Valvoline "Daily Protection" oil.