I was doing a little experimenting last night. The thought crossed my mind to turn of the DSC to see if throttle lag would be reduced from a dead stop. I turned off the DSC and put the vehicle in sport mode. I guess I bumped the shifter forward putting in manual mode first gear without even realizing it. When I took off the cars acceleration seemed to be the same as with the DSC on, but when the vehicle reached the top of first gear it didn’t automatically up shift like usual. I was surprised to find the engine racing against a rev limiter and the transmission restricted to first gear. I immediately shifted to Drive and the vehicle resumed a normal shift pattern. I was fairly quick at recognizing the problem and I am very happy the racing RPM’s didn’t hurt my engine. I think this could be a possible situation in any X5 or X3 so I am posting this story to give everyone a heads up.