For certain front drive shafts of front wheel drive vehicles, the grease on the front wheel side joints may be too watery. Therefore, when the vehicle is driven with the steering wheel turned far in either direction at the time of parking or starting etc., an oil film may temporarily rupture, allowing direct metal-to-metal contact. If this occurs, the joint sections may be put under excessive stress, and in the worst case, they may break, which would cause the vehicle to stall.