To wear out a Stihl chain, cutting clean wood and hand filing as needed, you definitely could get into triple digits.Honestly, how many cord do you have to cut to wear out a chain? My Stihl dealer does the buy one get one half price deal all year. I have good chains on all the saws and new ones in the box unused. Probably cut 10 full cord with the one on the ms460. Hand file every couple hours while cutting, careful to avoid rocks. Bet I cut another 10-15 cord before swapping to the half price chain.
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I once cut 7 cords of mixed species from aspen and balsam on the soft end to red maple and birch on the high end with Stihl RS without a sharpening. Finally rocked it or would have cut more.