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ZddPlus oil supplement, 4-oz. Zinc
In recent years, the oil additive known as ZDDP (Zinc Dialkyl-Dithio-Phosphate), has been removed because it causes catalytic converter failure over time. Similar to what happened with leaded gasoline. Most cars still on the road with converters have roller lifters which do not need ZDDP for protection.
If your engine was designed prior to the 1990s, your non-roller lifters require ZDDP in your motor oil to avoid premature deterioration.
Don't let your lifters run metal-to-metal. Keep ZDDP, via ZddPlus, in your motor oil.
Add the 4 fluid ounce contents of this ZddPlus bottle at every 4 to 5 quart oil change.