I have been on with some site clearup which has involved a few tree's having to come down and hedge reduction and clearing etc. I have been using some Stihl RS chain with pretty good results. Got to some dirty wood so decided to swap out to Oregon 21 (think it was bpx) which had just been freshly sharpened and it turned my 346 into a complete dog!! The chain was smoking and wouldn't cut anything like what the RS would. Tried it on a 15" sycamore and it was truly embarassing!! The saw was so hot and the bar and chain were too. Chain was throwing off so much smoke that it seemed like it was on fire! It did nothing but stall the chain even when atempting to let it cut under its own weight, i.e. no pressure at all. Checked the oiler on the saw and it seems clear, checked the oil filter which was clear also. Also cleaned all the bar and checked that the oil holes were clear and i greased the sprocket nose and clutch drum. Running Oregon LPX on the 044 and ran it on my old 357 too and it seems ok. Might treat the 44 to some Stihl chain...