the retracting steering wheel won't move if you manually set it at the default position to start. I think I keep mine all the way up and in (or close to it) and it never moves anymore - unless I change it.

as for the oil change - the synthetic can last up to 2 years (idrive will even set it as such) but recommended to change every 1.

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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