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You can also skip over to the e90 forum to read up on N55 engine issues. AFAIK, it is more reliable than the N54 twin turbos. I would say the zf6hp is less refine as the zf8hp.
Just make sure the oil is kept fresh. Coolant system is a biggie for all BMWs.
It's a low miler relatively speaking therefore you shouldn't be encountering lots of issues or major maintenance on the horizon.
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