Full Floater Posted January 4 Share Posted January 4 Should we/are we supposed to run a high ZDDP 15w-40 oil in our older engines? I have 5 675's and have always run whatever 15w-40 I can get locally, usually Walmart brand; and change it a little more often then some might. Never had an issue. But as things wear and get older, and oil specs change....do we need a certain ZDDP content or additive to help out in the wear department? Quote Link to comment https://www.bigmacktrucks.com/topic/73724-high-zddp-oil/ Share on other sites More sharing options...
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