Mb recommends shout to flush out the cooling systems.. buy a Big bottle and use that over 2-3 flushes. Be sure you have the t-stat out and ideally you want to open the block drain @ the same time.

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta