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flatjack9 · 02-15-2016, 09:31 AM

I don't think synthetic oil will affect the break in. I would not use it simply because it is expensive and you shouldn't leave the break in oil in for a real long time.

02-15-2016, 09:31 AM	#16
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,608	Re: Flathead smoke I don't think synthetic oil will affect the break in. I would not use it simply because it is expensive and you shouldn't leave the break in oil in for a real long time.