Last edited by mark38090; 04-14-2019 at 03:32 PM.
If you buy one gallon of 50:1 gas/oil, then adding 2.56oz. of two cycle oil will make your mixture 25:1.
I have seen several Chinese 2 cycle engines require 25:1 gas mixtures. The reason is because the internal tolerances are so much greater that more oil is required to lubricate the extra spaces between the bearing surfaces. Another way to say it is that these engines are cheaply built and as a result have large sloppy tolerances. Additional oil is required to keep these engines lubricated. These manufactures focus on low cost, not endurance.
A premix that covers 40:1 thru 50:1.......that's where they lose me. A 40:1 ratio can't be the same as 50:1......is there a screw on the side of the can to adjust it? If you want to alter a premix ratio, it sorta' helps to know what the starting ratio is.
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The difference between 40:1 and 50:1 comes out to just over a tablespoon of oil per gallon.
Even if they blended for the midpoint and went with a 45:1 blend, it's likely the people buying canned gallons of premixed gas aren't using a super expensive engine, or using their engine enough in a season to do much damage from the slightly off mixture. Shoot, from what I've seen, most people mixing their own for yard work probably have about that much slop in their measuring, anyway.
On the other hand, if they label it just for 40:1 or 50:1, the people buying premix off the shelf are more likely to pass it up if the label doesn't match the instructions.
ETA: I would think that the people who are critical about getting their mix right are going to mix their own instead of buying the gas in cans off a hardware store shelf.
Last edited by 230JHP; 04-15-2019 at 08:01 PM.
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Here's a handy chart that shows all the mixing ratios. If you can't find ethanol free gas you can use regular gas provided you add a treatment. If you go to an auto parts store you should be able to find Lucas Oil safeguard ethanol fuel conditioner. It treats up to 25 gallons so you only need one ounce per gallon if that's all you're mixing.
FWIW I always mix a little rich on the oil.
The worst thing that can happen is the plug carbons up and fouls a little quicker. Maybe a little more smoke.
Running lean on oil can cause a 2-stroke to seize up.
I'll take the smoke and fouled plugs any day.
My friend has a tree service. He runs 40:1 in his chain saws. I put sta-bil 360marine and a cap of seafoam in with my gas and oil. I can tell the difference if i don't.