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
"To my seed, may I lead you into no breed of evil. In the categories and stories I breed my sequel.
You know the money brews, blunts, and broken 22's. Monkey see, monkey do, shorty sipping sunny dew.."