I tried to send this before but made a mistake. Here it is: A friend sent me this the other day.The Machinist's Workshop did a study of oils in 2007 and found the following: none - 516 lbs WD 40 - 238 PB Blaster - 214 Liquid Wrench - 127 Kano Kroll - 106 ATM - acetone mix - 53 They tested on rusty "devices", don't know how they made each equal. Dan