Oil mix ratio Unless you ride it like a little girl you're going to burn the motor up pretty quick if you deviate significantly from 32:1. You can obtain this ratio by mixing 3. Similar to Mercury, Mariner, Johnson, and Yamaha outboard motors, the standard oil-to-fuel mix ratio of the Evinrude outboard engine is 50:1. Learn about 50:1, 40:1, and 32:1 ratios, and use our handy chart to determine oil quantities based on gallon and liter sizes. If you are using a different brand of chainsaw, you must make sure you know the kind of engine being used. Unsure of the age of your equipment? Use the 40:1 mixture. iOS and watch os app for managing multiple containers and fuel mix ratios. These types of engines use a fuel consisting of a gas and oil mixture. Easily calculate the appropriate premix for a 2-stroke engine with this gas oil mix ratio calculator. of two cycle air cooled engine oil with one gallon of regular gas. zujmfsyuedsctlkvsymgwlodgnfaeyuoxtzvvohbckkyefmadgehfpsrqmnorliwhebpf