I can answer your question.
The 550xi even with AWD does NOT have hydraulic steering. It's electric. Because of the V8, the hydraulic steering system wouldn't fit in the 550.
Only the 535xi have hydraulic steering.
2011 535i Alpine White, Oyster on black interior, Premium 1 & 2 Package, Magnaflow Full Cat-back Exhaust, JB4 Stage 2
Last edited by smashhell; 01-29-2013 at 01:55 AM.