Do impact guns lose their torque potential? I have a Husky that is supposed to generate 500ft.lbs, but it wouldnt budge a pinion nut. I brought it over to DK's and his Craftsman Professional model zipped the nut right off. My compressor says 6.4 scfm @90 psi, his is 6.5. Mine was dialed up to the max 130psi, I think his was too, 135 psi. I started wondering about my impact after I couldnt get a pitman arm off with a puller. I have some tool oil, but am pretty bad about using it, would that help?