I have a 2006 CL500 with AMG appearance package. This car body is in great shape. The issues known at this time with car are as following. 1. Right side Valve cover leak. 2. Rear main seal leak. I was told this is a 12 hour job and a shop quoted me $1200 pretty hard to believe. It has 2 bad air shocks leaking. I am searching for best option for coil over conversion kit. I heard strut master is NOT the way to go? I also hear the car runs like a buck board without hydrolic suspension due to no sway bar? There is a tapping in the front sounds like a compressor. Control arms are bad and my driver side has a bad ball joint. Also the sun room doesn't shut correctly all the time and I wish to put led inside the vehicle and replace fog light with led strip. My command center in trunk for radio and navigation is for some reason unwired. I bought an android touch screen mercedes look alike with 2 amps. I am in cleveland and really wanna get this car in tip too shape is it worth it? Or is 171k just to high mile to invest money into this car? Opinions?