Tip from my small engine repair guy. Use premium (without ethanol if
you can find it) if you mix your own 2-cycle fuel. Rather than Sta-Bil
use "Sea Foam" gasoline additive.
If you only need 2-cycle fuel for occasional use with chain saws, hedge
trimmers, etc your best bet is the pre-mixed quarts available from the
major manufacturers of tools using 2-cycle mix. Their pre-mixed fuel is
high octane, alcohol free, is the perfect ratio of oil:gas AND has
additives to keep the tool running properly. Shelf life - after opening
the sealed can - is ~ 2 years.
The manufacturer's use it in their pre-mix and I was told it was a for
the reason that it doesn't have ethanol. In IL all gasoline has ethanol
but just over the state line, in Wisconsin, premium gasoline does not
have ethanol added.
Not sure what all the higher octane does for the mix, but we damn sure
know what ethanol does to small engine parts.
Yeah, yeah. I've seen that. Note that the alcohol free gas is
predominantly premium octane (as otherwise stated in these posts) and
that it's not available in the metro areas.
Less than 100 stations in this entire state (in my small town alone
there are >10 gas stations) MIGHT have it on hand, and every one of them
seems to be "not exactly 'nowhere' but you can see it from there!" <g>
When I traded in my old 2 cycle mower for a new 4 cycle, the mower guy
told me not to pour the old 2 cycle gas into any 4 cycle engine.
I had Stabil in it and used most of it up over a maybe 4-5 year period
in 2 cycle chain saw and weed wacker before it went bad. Regular gas
with Stabil is put in my car with no problem after 2 years.
Most pharmacies will give/sell you a 10cc syringe and that is perfect
for mixing up a half liter of gas (50:1) (a water bottle, thoroughly
If you are just using a chain saw occasionally to trim a tree or
something that is about a tank of gas. I would burn the rest in your
car or just throw it away.
Run the saw dry before you put it away.
Rec90 may last a year or so but E10 starts going bad in 3-4 months.
I am sure someone will come in with a story about their 3 year old gas
being fine but there will be far more stories about old gas causing
all manner of problems.
I haven't had any issues with my 4-cycle engines, but bad fuel did gum up
the carb in my chainsaw. Real pain to fix. Learned my lesson the hard way
to add stabilizer to the fuel and run the machines dry if they'll be
sitting a long time.
I have also replaced some of my lesser used machines with cordless electric
models when possible. I picked up a 56V string trimmer and a 56V leaf
blower that work great. No fuel/oil to mix and store, they run quiet, start
every time, and work nearly as well as the gas versions for my needs.
Unfortunately, I have too much wood to cut and too big of a yard to go
battery power for the chainsaw or mower.
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