I have an old Stihl trimmer I have had for over 10 years. It starts and runs without any problems. I also have a Stihl chain saw so I mix gas using Stihl's oil mix for around the year use. I have worn out a trimmer head and replaced it. I live in a small town and there is a dealer a couple of blocks away at our local hardware store. I have the smallest trimmer and the shaft does seem short so my back hurts after a while. But I like the system because it always works without any problems.