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i've always used premix in old ass engines which havent ran in years.....my 350x engine for example, sat under a workbench for about 5 years+ .......put in some pre mix on the first fire up and although it smoked like james bond after about 30 minutes put in some normal fuel and she ran like a champ.......
won't hurt much, will just smoke and probably wont go too good under load......but shouldn't hurt a thing....