I know a good visual clue to bad mounts can be seen on non m engine mounts as they will create a hole in the hood insulation right above the power-steering reservoir cap. I changed mine out in the blown 330ci at 120k
On my current m3, @ 40k miles, last time I chcked it looked good will be looking for one at around 60k with new spark, and general maintenance
"And all of my limitations begin to fade away. In this place I have freedom It's here I wish to stay.
Thoughts become distant feelings, I'm going with the flow. I'll just sit still now and begin by letting go...
begin by letting go...."