Example, on my ‘80’s Husqvarna saws, two 2100’s, a 266se, a 240sg lasted till around 2002. Never touched them, I sold four perfectly running saws like new, I averaged cutting about 50+ cords a year. But I ran the 40:1 Xp husky oil at 38:1 mix.
Running the correct brand of the manufacturers two stroke oil. They ran better than the energizer bunny. I didn’t baby them, I’m an animal when I cut.
I’m very strict about maintenance and using the saws manufacturers two stroke oil.
There’s a lot of factors why the saws don’t last. The saws like the dirtbikes one must consider why they stopped running first. If not then the crank bearings, crank seals, gaskets, piston, cylinder, rings must be replaced. I noticed on any two stroke assembled case the old crank bearings seem to have no play. You think there good till you split the case. Then they show looseness in them. Since it’s apart to the case anyway for the cost of bearings, seals, gaskets why not do the case right. If the crank is good you end up with a new saw.