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Old 02-20-2018, 07:03 PM   #7
Senior Member
Join Date: Mar 2017
Location: Connecticut Shoreline
Posts: 1,135
Default Re: Oil viscosity (weight) for model A

20-50 oil is good for 15f to 110f. 20w at 15f, 50 at 110f.

Our Model A without a thermostat runs around 165 degrees in summer after good drive. Water only with rust inhibitor.

A well maintained Model A engine, driven only in summer, I do not believe needs a thermostat. 90 years, what has changed?
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