here is the scoop. your car is a bmw equipped with CBS. Condition based Service. Every 8th Oil Service, the Transmission is serviced, so it is not 100,000 miles. It can be 70k miles if you drive it hard, and 120k miles if you drive it soft. Second, the x5 transmission is equipped with a Plastic Trans Pan, over the course of owner ship, this pan will start leaking, most likely the sealing sleeve is leaking for the mechatronics connector. Most leaks occur at 30k miles. In which during repair your fluid will be replaced if the fluid is dirty.