BMW issued a recall on the X5, and X6 models

Certain vehicles may have been manufactured with defective front driveshaft universal joint seals, which could allow water and/or dirt to enter the universal joint, causing accelerated wear and/or corrosion, and resulting in vibration. If the vehicle continues to be operated in this state, the universal joint could eventually break, potentially damaging surrounding components and rendering the vehicle inoperative. This could increase the risk of a crash causing injury and/or damage to property. Correction : Dealers will replace the front drive shaft.