Well all they meant was to ensure it never goes under recommended, ever. I think her words were "be really careful about it".

It looks like the manual recommends (for 2 rows & sport pkg) 32psi for the staggered 20s at anything under 100mph, but that's with 106 fronts and 110 rears. If you are running on 106 rears, what psi are you guys at? I have had it at 35psi, which should still be comfortably under the tire's max. I'll drop it if you guys are running lower but I really want to stay away from that minimum since they stated that to me. I do want to get to the bottom of this.

Those with the new Proxes ST II should also be running on the 315 rears with load index of 106 only.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr