Rislone Engine Oil Supplement with Zinc Treatment, No. 4401, restores ZDDP zinc and phosphorus levels in engine oil to prevent damage and wear to the camshaft, valve train and engine. It can be used in gasoline and diesel engines, antique and classic cars, motorcycles, tractors, industrial and agricultural machinery and all racing applications. It was designed for engines requiring SL/CI-rated oils and older.
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