Click on the Calculate button to find out how many US ounces of specified two cycle oil (or whatever the oil type requirement is for your engine) are required. (Calculations in either calculator will also supply the appropriate converted values for the other.) For 5 gallons of gas, with a 32:1 ratio, the amount of oil required is 20 US ounces (156.25 ml), 4 ounces per gallon of gas (31.25 ml per liter). Experts agree that it is better to err toward the side of too much oil, rather than not enough. Typical break in period ratios are about twice the normal; 32:1 is generally 16:1 during break in. We suggest following the manufacturers guidelines but that is your decision. See our calculator for marine 2 cycle use. Here is some additional oil information that is pretty slick!