I've been using the Valvoline Max Life fluid w/ great results.. It's actually approved for use in other manufactures transmissions that call for synthetic.

You can usually find it @ the local McParts stores in gallon jugs...much handier picking up to of those over 8 qt size containers.

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