No two cars identical even coming from the factory, that's a fact. I have driven several cars with N52 engine and each felt a little different than the other.
My 328 had oil changed at 5000km and it had an occasional ticking noise. It seemed that highway driving will reduce the occurences, but not eliminate them completely.
Also the first year it was driven mostly for short trips, around 3km each. That might be a factor.
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Originally Posted by Dackelone
Simply: Type of oil being used AND more importantly OCI (oil change interval) I suspect plays a big role.
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