A Haynes or Chilton manual might cover oil changes, but a true W639 Workshop Manual is the 5,000+ page bible required to troubleshoot the intricate interplay between the engine control unit (ECU), the transmission control unit (TCU), and the body control module (BCM).
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Finding a high-quality manual can be tricky; many online "PDFs" are actually just short user manuals. A Haynes or Chilton manual might cover oil
