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cw253748 · 02-21-2018, 12:57 AM

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.

02-21-2018, 12:57 AM	#14
cw253748 Member Join Date: Nov 2012 Location: Clinton, WI. Posts: 49	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.