I have a '56 5.5hp Evinrude, I run 50:1 mixture in it. I think the original sticker in the hood says to run something like 20:1 with regular motor oil.
Hi, Schaffer.<br /><br />Your pre-1964 engine requires a 24:1 mix. That is 1 qt. of TC-W3 outboard oil to 6 gallons of 87 octane unleaded, alcohol-free gas.<br /><br />Good luck.