The whole debate as to use, or not use, a lubricant on wheel stud threads is a hoot. People have been using lubricant on the threads, even anti-seize, the mother of all metal contact surfaces lubricants, for decades. There are so many debates while the wheel installers, that use impact wrenches to whack the life out of the stainless caps and over torque the lug nuts by 50%, don't even get mention in the obituary columns.
Wheel studs are way over designed, and rightly so. One thing about lubricant is that it helps provide uniformity of bolt tension and clamping force. Think "warped" rotors. On the other hand, don't think "warped" rotors. LEVY might be listening.
I recently had wheel work done on my 2016 DGC
by a licensed Mechanic. The advantage of using that Shop is that I can enter the work bay and observe what's going on. Most places, one can't do that. He installed the wheels using an impact wrench and then checked them at some torque setting, I don't know what his setting was. Next time he will be using my torque wrench and I will be paying more attention. His torque wrench clicked out on all lug nuts.
Once home I decided to loosen all lug nuts, if necessary, and retorque. Well, to my dismay, these nuts were way over torqued. According to my torque wrench, over 140 ft.lb. was the break away torque. In one case, I eventually snapped off the 1/2" to 3/8" adapter I was using, which showed two things:
- way over torqued
- inconsistent clamping forces.
While we debate an additional 10%, or whatever, clamping force change due to thread lubrication, this "gross" work keeps going on.
NOTE: Just because the same size stud on a Ford F150 truck requires 140 ft.lb. of torque, doesn't mean that mine should be torqued to the same spec.
As to any additional torque, due to thread lubrication, do the math.
- clean the threads, nuts and contact surfaces with brake cleaner, or whatever.
- torque the lug nuts up to spec using hand tools
- check what the break away torque is, in an hours time.
- record the data and report back
- repeat the first step
- apply a light lubricant, say Fluid Film, lightly, to the threads only
- torque the lug nuts up to spec using hand tools
- check what the break away torque is, in an hours time.
- record the data and report back
Optional:
Repeat the above process using anti-seize
WARNING: Stay away from wheel installers that think lubrication of lug nut/threads is good. A can of spray lubricant and an impact wrench in their hands, is a license to kill.
