What indicates that lug nuts may be loose during an inspection?

The presence of rust or shiny metal shavings is a significant indicator that lug nuts may be loose. When lug nuts are not properly tightened, they can create a slight movement that leads to wear and tear on the metal surfaces. This movement results in the formation of rust or shiny metal shavings, as the friction causes the surface of the nut and the wheel stud to deteriorate. These signs suggest that the connection is not secure, which could lead to more serious issues, such as the wheel coming off while the vehicle is in motion.

In contrast, colorful paint on lug nuts doesn't inherently indicate looseness; it is often a method manufacturers use to mark lug nuts during assembly. Overtightening of lug nuts usually suggests that they are secured tightly, not loose. Using a torque wrench is a preventative measure to ensure that lug nuts are tightened to the manufacturer's specifications, and does not directly indicate whether the nuts are loose or not.