ZDDPlus Oil Additive is a must for keeping your vehicle's engine running smoothly and to prevent premature deterioration of the camshaft's non-roller lifters. ZDDPlus alters bearing and journal surface characteristics to prevent metal-on-metal contact, and reduces the tendency of parts to scuff or gall under heavy loads. Add a 4-oz. bottle to every 4- or 5-quart oil change.
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