My M54 is nearing 213k miles, and seems relatively smooth, but I've nothing to compare it to. It's my first BMW, and I never even sat in another, before, so I'm comparing apples to oranges if I judge its' smoothness vs my other vehicles (two General Motors V8's, an Ecotec four, and a 56k mile Lexus V6, all of which run smoothly).

The M54 only shows any vibration at all, when I first turn on the A/C compressor (mostly sounds/feels like a plastic panel vibration humming in the interior?), but it smoothes out rapidly and never reappears.

I have no idea if or when the two previous owners might've renewed the motor mounts, but I do know what a bad motor mount feels like, from experience on many other cars/trucks...just not on a BMW X5, so, is there a test to see if mine are still good?

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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide