I drive an om606 and the thing is pretty fast for a diesel. It keeps up with all modern cars, no problem uphill and it hauls *** if I need it to. If I'm cruising at 40 and I floor it, all the torque is right there to move it to 100 like it's nothing while smoothly doing it.

I've owned an om603 300d and it drove fine with traffic, no power problems with the a.c. cranked.

__________________
Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k