Back to the chains for a minute, I have a mystery that maybe someone here can help me with. I have a Stihl farm boss 290 and have been using Stihl safety chains with it for a while. I saw some new Oregon, non-safety chains on sale and bought several. They said they fit my saw. Yesterday I put the new chain on and within 10 minutes the front roller froze up on my bar. In addition, the chain was stuck a bit when I pulled it off the bar. I switched bars and again, a freeze up. I freed the rollers with WD40 and switched back to the Stihl chain and had no problems. Then I tried the Oregon chain again and loosened it up a bit on the bar and it worked OK. Any comments would surely be appreciated. I have a lot of firewood to cut before snow flies. The oiler doesn't put out a ratio of 1:1 vs a tank of gas. Could that be the problem? The bars are fairly new. Other than this I can't figure out what's wrong. I did notice that on the Stihl chain, there was a hole in every link and on the Oregon chain there was a hole every other link?