Mercedes-AMG is expected to move the goal post even further with the next generation of the E63, but until that time arrives, engineers are still busy testing pre-production versions of the model.

Sadly, testing comes with its ups and downs in almost equal measure, and the two engineers in charge of the camouflaged E63 in the adjacent images became stranded near a roundabout in Germany when their car stopped and refused to start again. &l…