Hello, last weeks I bought a Smart ForTwo Passion, 52 Kw, first registration 01/2009, with 87,000 km on the clock. Now I noticed while driving with open window that there are strange noises, similar to a chain rattle, when accelerating. These noises do not occur when giving gas in idle. The car drives also flot and switches properly. It is check book maintained and got an oil change with synthetic oil 5W40 at 85,000 km. I read on the internet that it can quite come to a rattle with the 451 smarts. Do I have to worry now? Or should I just drive the car further? The dealer said that it would be all normal with such a small engine and the noises could come from the differential, but that would also be normal.