I have seen tire shops oil studs, and my dad always did it, never lost a wheel. I have seen studs and nuts covered with rust, and super hard to get off. They were always on 4-wd drive vehicles that actually got off road use.

I couldn't agree more about not using impact wrenches, I hate those things. But how many people have new tires installed, or their old ones rotated, then go home, loosen the nuts, and torque them tight? Not many, most don't have a torque wrench anyway, and tire shops always use impact wrenches. Only exception I have seen to that was at an Les Schwabs in WA, where I recently had an alighment and balance. They used a impact wrench, set low, then used a torque wrench to finish the job...