I just talked to Bavarian because I had ordered the Esso fluid from them. They confirmed I needed the Shell M-1375.4 fluid. I just checked the esc site, and they have a Redline product that they say will work.

BMW E53 X5 N62 4.4L > Drivetrain > Transmission > ES#251177 Dexron ATF (D4) - 1 Quart - 8352230504

Has anyone used this fluid in there X5? I have been very happy with Redline fluids in my e30 for years.