Isaiah Posted October 27, 2019 Share Posted October 27, 2019 (edited) How many are using Zink additive in your old engines? They took the Zink out of the oil when they started putting Catholic Converters on the vehicles. Which is the best additive to use in the old engines? AMAZON has a good verity of it. Here is a link to Jay Leno's https://www.youtube.com/watch?v=VFeSTvohf94 Edited October 28, 2019 by Isaiah added material (see edit history) Link to comment Share on other sites More sharing options...
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