Your uncle was looking for a dipstick. These cars don't have one. You check the oil by using the car's computer and information display. The process is explained in the owner's manual.

If there is ONE car where it's necessary to read the owner's manual thoroughly, this is it.

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'01 SLK320, '79 450SL & '01 C320 -- What? 3 Mercedes? I am DEFINITELY crazy!!!