I own an Efco 152. Recently I was cutting and the sprocket tip on the bar became so clogged with wood chips that I needed a screwdriver and vise to get it unclogged (several times). Yes, it did have oil and the bar was oiled. And I grease the tip everytime I fill up the oil. I have never seen this, just wondering if anyone has any suggestions? Is the bar junk or defective? A saw shop around here told me the bar is junk. Looking for any help, thanks.