When I did my engine mounts on my 2006 X5 3.0 I did not have to remove any subframe bolts. Jacked the car up. Put a jack under the engine and set up the engine support. Unbolted the engine mounts, raised the engine with the jack and locked it up with the engine support. Removed the mounts. I found moving the jack to one side of the engine and causing the engine to rotate slightly created enough room to get the mounts out and in. As jobs go on these trucks engine mounts are relatively painless. At least on the 3.0.