noisey

I have a 2001 CLK with only 17K on the clock but I am concerned with the sound of the exhaust when the car is in park and idle, it sounds quite rough. It is a 230K, is this normal? Its still under warranty until september so I could get it changed but I am worried that MB will say its normal...

started my diesel this morning, while defrosting windscreen noticed engine was making a funny clanking noise, bit like hitting a spoon on a bit if metal, kind of intermittantley, but in some kind of rythem strange is this normal, whent away after warmed up, also on mornings like this is it...