30w oil

[Synchro909]

Originally Posted by leo

Hey Jynx, if you look for previous posts regarding motor oils you will find enough opinions to keep you busy for days. At the risk of being labeled a heretic I doubt that you could find a motor oil for automobiles that would not be adequate for a Model A.

I agree with that. Engine oils in the day were not very good. Even the cheapest oil available today is light years ahead of anything they had back then.
I use what ever oil is on special at the shops - usually 20W50. With a 180F thermostat, the engine temperatures are high enough that it does fine.