Original Mercedes Benz Factory Service Manual
Models 124.230/290
4Matic Automatically Engaging Four Wheel Drive
Condition: Excellent / all 227 pages / no rips / tears. Does have some writing which were notes taken during training by the factory tech who sold it to me.
Price: $60 shipped to the US

I bought a 1991 300E 4Matic with 60k and sold it with 250k with the original functioning transfer case. I was able to troubleshoot and make repairs with this manual (and some online help).

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07 E350 4Matic wagon, 06 S430 4Matic, 99 SLK 230
retired W210 (x3), W124, W126