I don't remember the brand, it was a few years ago. My thought was that if the mount was bad it would do it at all temps

Nope, it'll vibrate at cold idle, especially in gear.

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CENSORED due to not family friendly words

Idle is 700 rpm. Makes the sound when driving down the road as well until the car is up to temp. I'm wondering exhaust maybe? It sounds like my 1980 300SD until it gets warmed up. The colder it is the worse it is.

That is not normal. Maybe not catastrophic either, but its annoying. I'd be checking all the way down from Motor mounts to exhaust hangers. Something is worn out.

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DS
2010 CL550 - Heaven help me but it's beautiful
87 300D a labor of love
11 GLK 350 So far, so good
08 E350 4matic, Love it.
99 E320 too rusted, sold
87 260E Donated to Newgate School
www.Newgateschool.org - check it out.
12 Ford Escape, sold, forgotten
87 300D, sold, what a mistake
06 Passat 2.0T, PITA, sold

Las Vegas NV