Zinc oil supplement

justcuz said

The product I have been using for the last 15 years has been discontinued.
What would you suggest to add zinc when I do my oil changes?

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I am old school and people will laugh when I mention this but I use STP, which contains, Zinc at every oil change and I have been for the last 25 years in both of my SB Mopars. My motto is if it works dont change it...