I will try to have a sample of fluid from the transmission to understand what type of fluid they put before.

Transmission is a 6hp28X with a metal pan. I searched every where and no BMW X5 users have this tranny with a metal pan, I am thinking as the pan belong to a 6HP26x and fluid is already refilled before.

This fact made me go for a cheaper fluid, I think I will refill it 2-3 times.

regards