Friends new Mercedes C240...not only does it NOT have any visibility under the oil filler cap (there's a black grate there), but there's NO dipstick!!! Apparently, the computer on the dash checks the oil level and tells you when and how much to add (if needed). The owner's manual doesn't even say what oil to use (grade or otherwise)...only to use M-B approved oils specified by the dealership. How are you supposed to know if these oils are working? How do you do an UOA?? Any other cars now w/o a dipstick?