As the title says, I would like to know where I could find the serial number (or VIN) on the engine on a Mercedes-Benz C-Class C220 CDI W204 from 2012. The engine is the OM651. I am looking for it as I want to know if the engine is the original one. Thank you very much!
I can find no specific information for your question, but after looking at the engine block i suggest 2 places to look on the block. Reference 2 red arrows in the image below. It may be difficult to impossible to see the engine serial number on that engine fully assembled and installed in the car.