Wow. Mouse, your mechanic can get engine mount for rm50/piece. Not bad, where is the workshop? I just change a pair for rm360 at USJ, although mine e39. I replace all the arms & rods at the same time. Excellent ride now, but it still don't eradicate a very very very minor wobbling sensation I get during a cold start. Looks like need to check out the spark plugs & ignition coil, and probably an engine compression test.
[bimmer], you will have to visually inspect the suspension bushes or mountings to determine the need for replacement. The best way to tell that your suspension bushes need replacement of course, is that your steering and brake pedal feel. If problem persist when engine mount ok, looks like you need to check spark plugs & ignition coil, and even probably an engine compression test. Just chipping in to solve check your engine vibration problem.
cheers.