OK I have had my 735il for a full year now ,replaced rear brakes ,oil changes ,afew light bulbs( i am impressed when the car tells me which lite is out!!)now with 400,000kml. something should be needing replaceing or attention...I get no warnings . no problems starting running or anything..what am i missing??trans is great brakes amazing..power and quiet..what should I be looking for??I do have a leak in the rear self leveling shock right side .but at $800 I will keep adding fluid.