In daily life, when we are repairing our cars, we must never apply oil to the tire bolts and nuts. The following is an introduction from our Guosheng Auto Parts Factory: In wheel maintenance, a few private car owners, in order to prevent the bolts and nuts on the wheels from rusting, ingeniously apply lubricating oil to all the bolts and nuts during installation. Little do they know that this practice is not only wrong but also poses certain hidden dangers to driving safety. After the bolts and nuts are tightened, they have the property of self-locking with each other. After being coated with lubricating oil, the self-locking coefficient between the two becomes smaller and the self-locking performance declines. When a car is traveling at high speed, bolts and nuts are prone to loosening or even falling off, which can cause traffic accidents.