Brand new Troy-Bilt line trimmer. Followed all instructions in the manual. Used once, wouldn't stay running. Troy-Bilt said take it to authorized repair shop, which I did. Used the manual-specified fuel and showed the repair shop the manufacturer recommended fuel I used, which they affirmed was correct. Repair shop looked at it, put in new fuel and said problem was fixed. Troy-Bilt refuses to cover the service charge. Have called customer service numerous times, they say it's not a product defect so they won't cover the service charge. Called corporate office of MTD Products (parent company), cannot get a supervisor or manager to call me back. Can provide more details on request, but I followed the user manual exactly, so I don't believe there was any negligence on my part.