I just purchased an 05 CL 65 and it's a blast. I'm getting some work done under warranty due to a check engine light and trying to find the plugs - or a place to buy them cheaper than the $24\ea price at the dealership - since there are 24 of them. But, I want the matching plugs. Searching now....anyone know what the plug number is? I don't have my owners manual here at work. I have the MB part number of 004159-1403. It is probably a Bosch, but not sure. I may have to drive to the dealership and have them pull one off the shelf....but I'd rather buy them online for cheaper if I can. They probably don't have to be changed at 40K miles (even with a misfire code), but the mechanic is going to be in there anyway so labor will be $0.