Originally Posted by black bart
What ruins the chrome on the lug nuts is the impact gun I never use it on my wheels.
The reason that it is recommended that you torque the wheel is that uneven pressure will warp the brake rotor.
Anytime a wheel is removed it should be re torqued after 500 miles.
When I get new tires I drive home and loosen the lug nuts and then torque them because all tire shops will use a air impack and you will soon be paying for new rotors.
Last time I had a tire repaired I came home and checked the torque on the wheels he had used a impact gun and the lowest was at 30lbs and the highest was 130lbs.
NEVER EVER allow them to use air gun then drive it like that take it home and loosen and then torque to specs.
Sounds like you need to find a new tire shop.
The one I go to has some type of impact limiting extension that they use when first tightening the lug nuts with an impact. After using that, they hand tighten them with an impact wrench.
They sell hundreds of wheels and have signs all over the store about rechecking the torque on aluminum wheels in the first 50 miles. If you will stop by, they do it for you.
The incorrect tightening of lug nuts not only can warp rotors, it can stretch the lug bolts which can compromise their strength. Also the lugs may be so tight that you can't loosen them if you have a flat tire on the road. Tightening evenly and in sequence is important as well.
Using an impact should be done by someone that knows what they are doing. 250 to 300 pounds of torque is easily applied. Most of the time about 100 pounds is closer to what is correct. They do have a chart/book that gives the recommended torque values, but I don't know if it is from vehicle manufacturers or the wheel companies.