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Old 02-20-2018, 06:53 PM   #6
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Join Date: Mar 2013
Location: Columbus Nebraska
Posts: 165
Default Re: Oil viscosity (weight) for model A

Right now I have 15w 40 oil plus a bottle of STP. I think this should give me good residual lubrication for start up, and be good for hot weather , but I guess my main concern is if it is to thick to run down the passages to oil the mains. If you are running 20w50 plus the STP, I guess Mine should be ok though. At least if I am not starting it in very cold weather, which I won't at least not with out warming up the oil as I said.
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