It seems to be a thing with the oilers in those saws - I went through everything in my one (MS260) and sealed up everything. It still leaked out the bar oiler slot! Had to be coming out through the pump past the internal shaft - it is a simple round bar with a flat machined into it and I guess if the bar stops with the inlet hole from the tank lined up it just flows out. I got that sick of it I chased down a crashed saw and flogged the adjustable oil pump kit off it to upgrade the fixed oiler on my saw. Worked well, the adjustable flow was a good advantage but guess what still leaks out of the bar oiler slot!
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