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FWIW I work in an automotive engine factory .I know when they first built e-85 rated engines they had to change the formulation for the o-ring seals on fuel injectors because given enough time they did develope leaks . By volume it takes about 40 percent more alcohol than gasoline to produce...

I'm not sure if ethanol does any permanent damage .Given enough time it will damage soft components of carbs and crankshaft seals . Some of the last repairs I made on Stihl products it looks like they've changed the formulation of the seal as they are blueish in color and some of the newer...