At this point i guess it's out of your hand and all is left to do is sit back and hope for the best. Hopefully, when you get your ride back engine will be running just fine. Before driving out the dealer, i would have them show me the compression on every cyl.... Not sure how relevent this is but it would give me peace of mind.

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His : 2005 X5 4.8is (SOLD)
Hers: 2007 X5 3.0si (SOLD)
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Retired:
1999 518
2000 323i
2002 M3 (beautiful car)
2003 330Ci