If it is a 1931-1978 motor, it requires a 10:1 mix. Later engines can run 25:1. TCW-3 is the recommended Oil
yeah 1931 - 1978 they didnt change , and yes it is 10:1 apparently more to aid sealing the main seals ....such as they are . Dad bought one new in the mid 70's and that was ½ pint to the gallon , the fuel cap had a bit of about 1¼" brass tube on it that when inverted held the correct amount of oil for a tank full of fuel .
I have heard stories that some were used on troop folding landing craft during the war , apparently they can still be found buried on the beaches ...
