Re: High zinc oils
I just changed mine for the first time since I have owned it. 283 Canister type
Used Penn Grade, formerly called Brad Penn after Bradford Pa. The old Kendall GT plant...Has plenty of zinc. I used 10w 30... I have used it in my 67 427
Sting Ray 20w 50 mix. So far so good !
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1967 GMC 3/4 ton custom. 283 4 speed unrestored
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