Moot point since X1 doesn't come in n54 form.
Reliability is tough to say. Depends on previous owner treatment. General maintenance cost is higher. For example replacement of the AGM battery requires ecu reset which can cause 500-700. I've read quoted prices....
Tranny oil and filter change ~700
Diff oil ~ 300
Xfer case~ 400
Plugs ~ 500
That's assuming you can get the dealership to perform these tasks. Go indie or diy to save money.
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