check under fuel additives, Gregg sells at a good discount if you want to mail order.
http://www.lubricationspecialist.com/index.php?cPath=31&html=amsoil.htm&osCsid=04b54448125d13ef2df5129506c073c7&amsoil=true

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!