Thread: 30w oil
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Old 02-05-2019, 10:05 PM   #3
Junior Member
Join Date: Jan 2019
Posts: 2
Default Re: 30w oil

Don't think Rotella has zinc any more. Its a moot point in an A as zinc was not an additive when the Model A was new. Zinc was introduced for the high compression engines of the 50's and 60's
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