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Most two cycles are 40:1 ratio. The easiest way is to purchase 2.5 gallon gas can, and the 2.5 ratio oil bottles. Place the full bottle of oil in the can and then fill with gas. Mix well and will be ready to use.

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You can do that but I wouldn`t 40 to 1 means 40 parts of gas one part of oil. 50 to1 means 50 parts of gas to 1 part of oil. So the 40 to 1 mixture is more oily and provides better lubrication for your piston rings.
Use a 40:1 two-cycle oil mix ratio. One gallon of gasoline combined with 3.2 oz of two-cycle engine oil. Unsure of the age of your equipment?
If your manufacturer recommends a 50:1 fuel/oil mix, it means you need 50 parts of gas to one part two-stroke oil. To mix one gallon of fuel at 50:1, add 2.6 ounces of two-stroke oil to one gallon of gas, as shown in the chart below.
Fuel Mix. According to Stihl, gas and oil for leaf blowers should be mixed at a ratio of 50 parts gas to 1 part oil. This amounts to about 2.6 ounces of oil to each gallon of gas.
50 to1 means 50 parts of gas to 1 part of oil. So the 40 to 1 mixture is more oily and provides better lubrication for your piston rings. The downside is it will foul out your spark plug sooner, but that`s no big deal because it`s simple to pull the plug out and clean it and stick it back in.
For a 50:1 ratio of gas to oil, use 2.6 fluid ounces of oil per gallon of gas. For a 40:1 mixture, use 3.2 fluid ounces of oil per gallon of gas.
For example to mix 50:1 you use 50 parts fuel to 1 part oil, which equals one litre of fuel to 20 millilitres of oil or 1 gallon of fuel to 2.56 fluid ounces of oil. For detailed instructions on what you need and how to mix a batch are here.
Mix at 50:1 (20mls oil per 1 litre fuel) when you`re using STIHL 2-Stroke oil. To prolong the life of your 2-Stroke fuel mix you can add STIHL fuel stabiliser to extend the fuel`s shelf life up to 12 months. 15ml of STIHL fuel stabiliser will treat 5 litres of fuel.
For a 50:1 ratio of gas to oil, use 2.6 fluid ounces of oil per gallon of gas. For a 40:1 mixture, use 3.2 fluid ounces of oil per gallon of gas.
TOM: Yes, it`s fine to use it in your car. It`s a relatively small amount of oil (1 part oil to 40 parts gasoline). RAY: It won`t harm the engine, the fuel-injection system or the catalytic converter.
All STIHL gasoline-powered equipment uses a 50:1 gas and oil mixture.

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Do I need gas and oil mix – Poulan Super 250a Chainsaw Plate
ANSWER : I think Poulan uses a 40:1 ratio to one gallon of gas, however I have always used 50:1 the same as my sthl saws with no issue. I would rather have more oil mix that to little.

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Do you mix gas and oil in this trimmer – Ryobi 30 Cubic Centimeter Curved Shaft Gas Trimmer
ANSWER : Yes. Verifythe ratio, either 40:1 or 50:1

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I need the gas mix oil ratio for the Poluan Pro 42…
ANSWER : 40:1 gas to oil ratio.

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What is the fuel to oil mixture ratio for my gas featherlight weedeater?
ANSWER : Hi,That oil/fuel mixture would be 50-1 or 2.8 ounces per gallon…heatman101

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How do u mix the 50/1 ratio oil and gas mixture
ANSWER : Mix 2 1/2 oz of 2 cycle oil into 1 gal of gas

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What is ratio of oil in gas – Hitachi RB24EAP 23.9cc 2 Stroke 170 MPH Gas Powered Handheld Blower
ANSWER : Anywhere between 25:1 and 50:1

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Need gas mix solution – Craftsman 25cc 2-Cycle Gas Blower/Vac
ANSWER : Check age of gas. Cannot be more than 30 days old.

Make sure to use fresh gas w/synthetic 2-cycle oil @ 40:1 ratio
(1 gal.) Gas to 3.2 oz. Oil).Do not use old or stale oil/gas mixture. Always
use the proper oil/gas mix. If you do not, your engine will suffer rapid,
permanent damage.

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DCS520 PETROL/OIL RATIO
ANSWER : 40 to one is a good mix

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