Is it recommended to add a lubricant to a stud to increase clamping force for the wheel?

Using a lubricant on wheel studs is not recommended because it can lead to inaccurate torque readings when tightening lug nuts. The clamping force is created through the friction between the lug nut and the stud, and the manufacturer-designated torque specifications are based on a dry metal-to-metal connection. If lubricant is added, it reduces that friction and can cause the lug nut to be tightened either too loosely or too tightly, potentially leading to wheel separation or warping of the wheel.

Moreover, a slippery surface might cause the nuts to loosen over time due to vibration and movement, which can create serious safety hazards. It is essential to follow the manufacturer's guidelines for installation and maintenance to ensure optimal performance and safety of the tires and wheels. Therefore, the best practice is always to install wheels dry, as intended by manufacturers.