80 MLS of 2 stroke oil to one gallon of fuel and it doesn't matter what octane, of course the higher octane is better cause it burns cleaner. To much oil will gum up your carburetor and engine.
50:1 fuel to oil
Use 100 ml (3 1/2 ounces) per 4.54 litre (1 gallon) of 2 cycle oil. Use the highest octane that's available. Make sure you shake it before you use it, each time.
SOURCE: What is the correct fuel mixture for this machine
Every Stihl I have ever touched requires 40:1 fuel mixture.
SOURCE: What petrol/oil mix should be used in a McCulloch
The specified ratio is 40:1
40 parts gas, 1 part oil.
SOURCE: What is the mix - petrol/oil for a 2 stroke
typical mix is 40:1 to 50:1... The oil containers should have a chart for the correct ounces per gallon.. I would use 40:1
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SOURCE: mcculloch t 240 petrol will not start
If your petrol has been sitting in the machine for a long time then yes it is your petrol. Mix a new batch usually you cannot let that sit around for more than 30 days, I always try to use fresh mixes, usually that means making smaller batches unless you use your trimmer quite a bit, most people do not though and that's when problems arise.
SOURCE: what is the petrol mix
depending on which country you are in it is as follows UK (with stihl oil) 50:1 USA either 32:1 or 40:1
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