Hard to say... These cars are generally so quiet that it's difficult to pinpoint a noise.

The only noises my car has made over the time I've owned it was some chassis vibration from bad engine mounts and also, at highway speed, I get a gentle "rummm, rummm, rummm" from the transmission area that sounds maybe like the driveshaft.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250