The weakest link in your drivetrain may be the hydra-mounts used for mounting the engine. While they get the damping job done, they can be prone to fatigue, sagging and/or leaking even with only limited hard use.
Love the custom tuned X3! Thanks Brenspeed!
P. Seabrink
My 2011 GT Now Screams with your tune!
K. Fidenza