That is a matter of choice. I own a 320 and I think it is a little under power. I wish I had gotton the v8. But that is said done.

So if I were to trade in my 320 I would not get another 320 for sure.

The extra features are not worth it. Because you lose a tone of money when you trade in.

So my opinion is that if you are going to trade in and if there is a ml 55 or 430, 500 near you at a reasonable price, and you got the money to spend trade it in for those not another 320.

blau

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Silver Honda Accord, 2006
Silver G500, 2003
Silver SLK-320, 2002
Black ML-320, 2000
Bule Porsche 993 Targa , 1997
Silver Merkur XR4Ti, 1987