N57 engine rattle on start up....
My E90 330d SE LCI has the N57 engine, which is a bit "rattley" from cold or warm, for the first couple of miles driving. Nothing too bad, and when fully warm its very quiet.
Is this normal for the N57? My previous 330d had the M57 engine, which was quiet from start-up.
The noise is difficult to describe, only that its a bit "tappity".
The car has done 16k miles now, and has always sounded as it does now, from buying it at 10k.