That's correct the running in seems very important and there are strict guidelines from Mercedes. Even a big sticker on the front screen to remind you. I am always very careful running in the engine's as result of this all my cars have no (or very limited) oil consumption. Even the 911 Turbo uses only 0,5 l per 10.000 km. What surprises me is that in these modern engines there are performance differences. In my first R8 (V8) the engine was replaced under warranty. The second engine was much faster. So Christian you have to control yourself in the first weeks with the E63. I can tell you from the experience with my AMG GT-C this is sometimes not easy!