is the z4 cabin suppose to vibrate after driving a few miles?

[cruisingdownthestreet]

is the z4 cabin suppose to vibrate after driving a few miles? not in a bad way like an old car that's about to collapse, more like it vibrates to the same rhythm as the engine. sometimes it vibrates, most times it doesn't.

my final check-up is due before my warranty expires and i want to know if this is something i should bring up to the dealer.