What is a reliable way to determine the engine number in your car? I have a 1987 260E but it has the original engine replaced with a used one so I can't go by the VIN to get the engine number. Is there a way I can read it off the engine block somewhere? It should be stamped somewhere right? For all I know it might not even be a 2.6L liter in there, could be a 3.0L as the two are almost the same size. Thx