I'm about to fly to Chicago to buy a 2002 E320 4MATIC wagon Designo with 80K+ miles. Are there any commonly known mechanical or electrical issues that I should expect in the near future or is there anything in particular that I should look for before I purchase this E320? I have finally talked my wife into this car and I don’t want it to turn around and bite me in the butt! I would appreciate any advice and thanks for your time.