Just buy good fuel and oil and rotate it each month,the gas trimmers have more power,but can be problematic with ethanol gas.
I agree. Fuel can kill even the toughest of machines. I only use non-ethanol in all my mowers, dirt bikes, chain saw, etc. And I even add Stabil in for added measure. Oh, and I have had a Toro Gas weed eater that has failed to give up the ghost no matter how much I abuse it.