AMG Doesnt have to be for MB cars only.
"AMG" is an abbreviation which stands for: Hans Werner Aufrecht (A) and Erhard Melcher (M) who were partners, while Aufrecht’s birthplace of Großaspach (G) supplied the third letter in the company name.
Now days a AMG engine is a way of MB to say that the engine was put together by hand. Also AMG is mostly reserved for the performance department of MB