Quote:
Originally Posted by fiddy yen
DO NOT switch to a lower octane as your N55 motor will run lean.
I too have a feeling that this is a Fuel issue. Next time this happens press the BMW Assist button so that it sends a diagnostic capture of your X3 to your respective service department.
Hopefully this will give them some more info since they cannot replicate it.
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As I mentioned originally, they *are* able to replicate, they just can't explain it, or fix it.
I do have the N55.
I'm currently buying my fuel from Shell, using their Premium grade which is 91 octane here in Quebec. I used the same station for several years before with my 2008 Cooper S which never had any trouble.