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Forum: Model A (1928-31) 05-24-2019, 03:22 PM
Replies: 12
Views: 3,282
Posted By duke36
Re: ZDDP additive reacts with yellow metals?

Search other threads. Lot's of discussion about motor oils and gear lubes.
The Porsche club of America did some tests where 356 engines were broken down and measured for valve train components wear...
Forum: Model A (1928-31) 05-24-2019, 11:18 AM
Replies: 12
Views: 3,282
Posted By duke36
Re: ZDDP additive reacts with yellow metals?

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...
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