Zddp

Tony Fields said

4 oz. per oil change.

I just use Shell Rotella T as it has ZDDP in it already.

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Tony,
Be careful with the Rotella. At one time,it was a great source for ZDDP.
The tip was to go to WalMart,and get this great hot rod oil,on the cheap.
But along with many other oils,the ZDDP has been removed.
Blame it on the tree huggers.