Hay, there's two sides to every story. I don't use oil, It's to messy for me. There is an exception however. I just rebuilt the all metal hex after my first hot head jam. I reamed out the finned cooling tower, and heat break with a 5/64 drill. Next, I caned the nozzle and added a new one ( they cost less than $2 ). I then poured Mobile 1 synthetic motor oil thru the extruder. I then blew it out with about 15# of air pressure. So far I have run about a reel of ABS and about 1/2 reel of PLA thru it. I think that Mobile 1 just hangs on in there and I don't have to fool with the messy oils. Just my thoughts, Frank.