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Old 02-21-2018, 12:57 AM   #14
cw253748's Avatar
Join Date: Nov 2012
Location: Darien, WI.
Posts: 42
Default Re: Oil viscosity (weight) for model A

Hi Al. Your car doesn’t need the zinc additive. It was more for cars in the 40’s and 50’s etc. with stiffer valve springs.
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