Great story. Does he have any other Dolmars hanging around that he wants to sell cheap ?
Only problem with Dolmar is lack of good dealers otherwise you would see a lot more of them. I've run them. I've got 2 friends who own them. The saw shop I bought my Jonsereds from also sells Dolmar. I just love the Swedish stuff too much to get the Dolmar but man I came real close to getting one.
I'm not surprised you sold the Stihl 170. I ran a Stihl 250 a few weeks ago man what a terrible experience. It wouldn't oil enough so I had to keep taking the bar out of the wood and open it up so the chain wouldn't dry up. Power was so so I guess but at $350 for a new one there's a lot of better saws out there at that price. Don't get me wrong stihl makes awesome pro saws though love their pro level stuff.
As for your 28 inch bar I agree with Jon it's really a tad too big on a 60cc saw. If you have that one or 2 super huge tree and just have no choice then ya it will do it but slowly. However it's really best suited for a 20 inch bar and the 24 inch on occasion when you need it. In my opinion anyways.
For what it's worth my buddy has a 6100 in his tree service fleet and it gets used a lot. He bought it because it was cheap and there's still two older Stihl 036s around the shop and that Dolmar far far out cuts those old ( and tired ) 036s plus it feels lighter and is simply better to run in my opinion. I've spent lots of time with it so I'm speaking from experience. That's why I speak so highly about Dolmar. That 6100 starts every single time in 2 pulls. It's the easiest starting saw I've ever used. Not sure why but it's a fact I've come to realize.