I began to wonder about this after the post where the guy burnt out a Ryobi. I have a small, Curved shaft, Weedeater that I have used on our 1 Acre property for 12 years, No problems, only ever changed the trimmer line. No winter preparation just an extra few pulls to get it started in the Spring. The thing is, I never run it full throttle unless the grass I'm cutting requires full throttle! Normally for light grass and and weed stems I only run about 1/3 throttle. Why would the instructions state grass should be cut at full throttle?