It depends greatly on the oil. There are several "smokeless" oils on the
market now for outdoor power equipment, that are "one mix" for all
engines. Some are better than others. I have been using Interlube's
Optimol 2 cycle mix in all my engines, two AND four stroke for several
years, and recommending it to my two cycle customers for even longer. I
started using Optimol in my two strokes when it was first introduced in
the US. Back then, they would extend the original warranty by 50% if you
ran only their oil from day one in an engine. Due to the vagaries of
mixtures and carburetor mis-adjustments, they no longer extend the 2
stroke warranty, but I still use and recommend the oil as it is
virtually smokeless from the first pull of the engine. At home I use it
in all my engines because I don't use more than a gallon or two of gas
all summer long, and depending on the snow fall amounts, maybe another
gallon all winter. By using it in everything, I only need one gas can in
the garage, and can never end up putting straight gas in a two stroke
engine by accident. The oil doesn't hurt my four stroke engines at all,
in fact, it helped free up a sticky intake valve in my chipper /
shredder that I was too lazy to take apart. And since many newer two
cycles now have catalytic converters, it has to be formulated to not
harm them anyway. I do mix it a little more oil than recommended though.
I mix it at 64:1, or one "pouch" (1.8 oz.) to 0.9 gal (US) 89 octane
unleaded gas. The manufacturer recommends up to 100:1, but I keep my two
strokes running a little lean for performance, and the extra oil keeps
me from having heat seizure issues. I also always recommend my customers
do the same 0.9 gal mix, as I cannot know what their carburetor settings
Optimol is also sold as Sten's Mix, and Snapper / Simplicity and comes
in "pillow packs", sealed plastic pouches that look like a miniature
For Poulan, Echo, Stihl, or other saw manufacturer oil, I would run that
at the mix labeled on the bottle (except Homelite or the new McCulloch,
these I would only use in their products).
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