Wow, that is a big expense every 50K miles.

Seeing you are in the ATL area, if you would like a second opinion give Alan a call over at www.germancarrepair.com. I have been taking mine to them over the past year and have been very happy with their work. Just had them do a tranny rebuild. I have a 136K miles on my X and he has never mentioned anything about a carbon build-up issue. He has told me though if you plan on keeping the X you should do the oil every 5K miles instead of the recommended 15K.

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!