We had an ms170 on the farm here that had seen a LOT of use (great silviculture saw). It bunged up solid late last year. It got brought home from the Stihl dealer this week all put back to right and ready to go. Took a while but they came through (we didn't chase them about it though). Forget how long we had it before it went south (actually forget what the warranty period was) - but it was a while. Think I'm a fan now - and good local dealer service is good to have. Buy that oil when you buy the saw kids!