Run the oil that lubes the engine. I've run stihl ultra @ 50:1 for 8 years full time in the woods and only grenaded 1 saw. My oldest one and it had almost 4 years full time in the woods. Had one bottom end over haul at 2 years and ran like a race car till it died. I cut timber not fire wood. Not going easy on saws either. Production cutting
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