I was stuck on how to replace the spark plugs on my 4.4 x5 2005. I could not find X5 4.4 N62 engine DIY instructions for this on any X5 forums and was stuck- Bentely and TIS are at best sketchy on the V8 N62 engines. However, this absolutely awesome youtube video saved me!
I was surprised that at 92K miles, the original spark plugs were still quite clean! I also replaced the fuel filter and my wife says the car has tremendously improved in performance. I also noticed some improvement but thought it was in my head but she drives it most of the times.
Here is the video:
BMW E53 Spark Plug Replacement DIY Guide6/10/2012In this DIY guide, I review how to remove the top engine cover and replace a spark plug on an 2005 BMW X5 4.8is (E53). Note: THE USE OF THIS DIY IS FOR YOUR REFERENCE ...
http://www.youtube.com/watch?v=jUevDgIY5DU