Quote:
Originally Posted by duke36
It can, but zinc not necessary in trannies, rear ends and steering gears, etc. Rotella and other motor oils used to be higher in zinc, but it was found to affect catalytic convertors. Some people add the ZDDP to motor oil (not hydraulic oil) in classic cars for the valve train.
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Duke36, ZDDP will not be a problem to the transmission gears ?
If I use a mixture of 600W oil and STP, the ZDDP will not be a problem ? Also for any yellow metal I could have there ? Mine is a January 29 Tudor and I do not have idea how much is still original in the transmission.