Modern motor oils have changed and no longer include the Zinc, ZDDP, and extreme pressure additives that are needed to protect the camshaft and lifters with flat tappet cams. The 4 oz. bottle treats 5-7 quarts of oil and prevents scuffing, galling & provides protection for the valve-train on your muscle car, hot rod, street rod, or classic car. Compatible with synthetic, petroleum, and blended motor oils. Add a bottle to the crankcase of your engine at each oil change.
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