I run non ethanol in my older early 90's OMC motors for two reasons, one that's what they were designed to run on and two the fuel tanks are pre ethanol era. I run ethanol in my truck, four wheeler, small engines and anything modern. I have a small 2.5 Suzuki I bought last year and the owners manual recommends non ethanol 92 octane or higher, but states you can use ethanol gas, so I do. I agree with others, gas sitting for long periods without a stabilizer additive is probably the biggest enemy. I had an 08 Yamaha 40 and ran nothing but ethanol thru it for more than 5 years with 0 problems.