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Shu47 · 08-14-2017, 02:15 PM

If a stock engine then go with Ol' Ron and run 10W-30 or straight 30 or 10W-40. The flathead is not that picky. I agree with those that say zinc is not an issue.

08-14-2017, 02:15 PM	#29
Shu47 Senior Member Join Date: Feb 2011 Location: Maltby, Washington Posts: 187	Re: Best oil for an 8ba If a stock engine then go with Ol' Ron and run 10W-30 or straight 30 or 10W-40. The flathead is not that picky. I agree with those that say zinc is not an issue.