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Re: do it use mixed gas and what type of oil
Use a quality 2 cycle oil and mix it to the OIL supplier's recommended ratio. Today I use Stihl 2 cycle oil mixed @ 50:1 in a Pioneer that I purchased new in 1980. There are no gouges or scratches on the piston or cylinder and I have no carbon build up on the piston top. The manual (on stone tablets) recommends 24:1. Over the years the mixture has leaned from 24:1 (Saw Recommendation) to 28:1 (Lawn boy mower recommendation) to 32:1 (Oil provider 8oz/2gal - used for many years) and finally the last 5 (±) years 50:1 (Stihl 2.6oz/1gal)
Today most gas in the US of A contains ethanol; not good with chainsaws. Mix what you expect to use within a few months. Anything over 6 months old use up in a 4 cycle engine. HTH Lou
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Mix the fuel and oil in a suitable container that is airtight with a secure stopper to ensure the fuel mixture has a long shelf life. Keep the funnel, spout, container, etc., dry and very clean. Storing it all in a large plastic bag serves very well for this purpose.
Any quality engine oil can be used but an oil of the recommended type and viscosity will produce much better results. Purists and traditionalists still like to use vegetable oil but this has a very short useful life and dubious results. Self mixing 2-stroke oils are best and synthetic-based oils are reckoned these days to be superior.
Put fuel in the container first and then add the correct quantity of oil for the number of litres of fuel, close the container and shake with vigour for a few seconds and then transfer the fuel to the tool.
The number of ml of oil to use per litre of fuel will vary depending on the engine type, manufacture and age. The fuel/oil ratio is often marked on the fuel tank or cap, 30:1, 40:1, 50:1, etc.. 50:1 would require 20ml of oil per litre.
Some 2-stroke oil bottles have a useful measuring scale on the side...
Two cycle engines run on a mixture of gasoline and oil. Each engine type is designed to run on a specific gas-to-oil mix ratio.
IMPORTANT: Use only oil that is labeled for use in "Two-cycle" or "Two-stroke" engines. Home Depot and other stores now have "premixed fuel" of gas and 2 cycle oil.
To mix two-cycle fuel, start by putting correct amount of oil in gas can. Then slowly add correct amount of gasoline. Do not try to mix gas and oil directly in gas tank of equipment.
IMPORTANT: Do not use any fuel that is over 30 days old. Do not mix more fuel than you are likely to use in a month. Old fuel can gum carburetors and prevent starting. Always use fresh fuel.
The chart below shows correct amount of oil per gallon that each mixing ratio requires. Expect that yours will be between 32 gas to1 oil and 50 to 1. 32:1 and 50:1 are most popular. RatioGAS:OILUNITED STATESOIL per 1 U.S. GALLON Gasoline
(128 oz.)*INTERNATIONALOIL per 1 IMPERIAL GALLON Gasoline
(160 oz.)*INTERNATIONALOIL per 1 LITER Gasoline
This engine is certified to operate on
unleaded gasoline. Before operation,
gasoline must be mixed with a good
quality 2-cycle air*cooled engine oil.
We recommend Craftsman brand oil.
Mix gasoline and oil at a ratio of 40:1
(A 40:1 ratio is obtained by mixing 3.2
ounces of oil with 1 gallon of unleaded
gasoline). DO NOT use automotive oil
or boat oil. These oils will cause engine
damage. When mixing fuel, follow
instructions printed on container.
Once oil is added to gasoline, shake
container momentarily to assure that
the fuel is thoroughly mixed. Always
read and follow the safety rules relating
to fuel before fueling your unit.
Depends on what type of saw it is some very new ones use 50:1 oil fuel mixture older ones use 25:1 mix and the larger the bore or engine capicity you should probably use a little more oil to protect it, Mose saws will give the oil fuel ratio on the gas cap or in the owners manual
go to your hardware store and ask for some 2 cycle 50:1 oil, mix that with a gallon of gas and you're good to go. Before you mix, make sure that you read the oil container for it's recommendations! You can purchase a small container of oil that is all measured for 1 gallon of gas