One of my saws is a Poulan 290 that came with a 20" bar, now quite happily using a 18" oregon bar and cheap chains from wally world...sometimes it will leak a bit of chain oil, but since it gets checked every time before use, no big deal.
Doesn't quite cut as fast as the Stihl Farm Boss (also with an 18" bar and chain) with 18" cordwood, but is half the weight and is far better for cutting brush. However, the first two Poulans I got from TSC had bad oilers...and they would only take a return on the first bad one. So it got shoved into a corner for a year and I spent the big bucks on the Stihl Farmboss (also called a 290 Farmboss, think Poulan is trying to compete with Stihl)
Anyhow, last winter I went through over 10 gallons of chain saw gas, and three gallons bar and chain oil. My favorite bar and chain oil was the premium stuff sold by northern tool. And plenty of chains...time to procure and mount a chain saw sharpener...
Anyhow, enough on chain saws, had the Farm Boss out yesterday to cut 3" rounds of 18" hickory for throwing knife targets.
Howard