The only OPE I have that is specified to get the TCW-III is my 2 stroke Toro (Suzuki) snowblower, all the rest gets the air-cooled (TC) 2 stroke oil. Apparently, this is recommended by Toro because it is ashless and results in less deposits in the slower revving (3600 rpm) snow blower 2 strokes run in low outside temps. Blowers, weed wackers and hedge trimmers can run up to 9,000 rpm in normal use, so they need the air-cooled spec oil. However, in some of their literature Toro indicated that the 2 stroke snow blowers could be run on TC air cooled spec oil if TCW-III wasn't available. I guess you might see an increase in deposits, or have to clean the exhaust port more often, I checked mine a few years back (running full syn TCW-III) and it was really clean. So maybe there's something to this.....