my x5 was serviced about 2 weeks ago(reprogrammed DME) and it was noticeably louder and more sluggish but now it feels to be back to normal. except the fact that the steering still wheel vibrates more. the engine noises are reduced noticeably in past couple of days.
it's pretty strange because when i got it back from a bodyshop back in october it felt noticeably harsher for few days then later on it began to ride smoothly.. it's not just my imagination i think X5 is a selt adjusting vehicle.