I have a 1973 6 HP Evinrude motor and I was wondering what oil/gas ratio to use. I've heard 32:1, 40:1, and 50:1. Which is it?<br /><br />Also, I have a 6 gallon tank. Is there an easy way to tell how much oil to put in the tank? Such as one or two pints of oil for every full tank?<br /><br />Jeff