This calculator requires the use of Javascript enabled and capable browsers. There are two calculators here, one for US values and one for metric values. This calculation determines the exact quantity of oil required for a given ratio of gas and oil suggested by the manufacturer of the engine. That calculated number is determined from the amount of gas available for the mixture. That amount is usually an added number, such as 4 gallons, 5 gallons, 10.2 gallons or similar. Enter the number of US gallons of gas added to the tank; the default is 5 gallons. Then, enter the mixture ratio of gas to oil. Most marine requirements, such as personal water craft (PWC), jet skis and outboards, are 50:1, gas to oil. If you are uncertain, consult your owners manual. Enter the ratio value or accept the default. Click on the Calculate button to find out how many US ounces of marine 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 50:1 ratio, the amount of oil required is 12.8 US ounces (100 ml). 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; 50:1 is generally 25:1 during break in. Do NOT add oil to the fuel of 4 cycle marine engines. We suggest following the manufacturers guidelines but that is your decision.
If you are mixing your oil and gas in the water, use great care to avoid spills that will ultimately pollute the water. Also check the two cycle engine requirements for the body of water you are planning to use. Here is an example of what the controversy is at present. See our calculator for non-marine 2 cycle use. Here is some additional oil information that is pretty slick!
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