When I was swapping the plug connectors and the spark plugs, I NOTICED that the middle ignition coil is DIFFERENT from the other two?! This doesn't seem right...are all three coils suppose to be the same spec? I guess I have to order an ignition coil to swap out the suspect "wrong" one. I can't believe some Mercedes dealer put in the wrong part, and the spark plug is black?! Please advise guys, thanks..

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