Originally Posted by brian5

Here's the detail from the 2008 X5 Owner's Manual that says
1. 32 psi in front and
2. 35 psi in rear
for all 20" wheels for X5's with third row (whether 3.0si or 4.8i and with or without sport package).

If you only have two rows of seats, it's 32 psi all around...