I bought a string trimmer 2 months ago and it has been in the shop twice for the same problem. It runs for a while then it will not start. The first time the repair man said it was a fuel problem.So, I mixed the fuel the way he suggested using the oil he recommended. Now it has been in the shop for a week and it still has not been repaired. This is my third Poulan string trimmer that I have had in the last 7 years. I have been satisfied with the first two, but I am not at all happy with this one.