Smart ForFour AMG Black Series Night Edition Premium Plus 125 Powered by Brabus
C suggests that there are other items and more labour involved than a straight service.
Neither of my cars have anything other than A or B, and so I have no direct experience of what to expect. What I have heard though is that any service other than an A or B has been phased out to either A or B plus additional items.
To be honest the c service means nothing on the dash it was an old thing they used and havent changed it. Your car will be due a minor or major service and then what other additional things it will need depending on age and mileage of the vehicle
Welcome to yet another traveller on the wild and wacky Assyst + road.
Basically Assyst + letters mean nothing other than a rough approximation as to how much work the car thinks you need (letters correspond to number of hours).
The actual service sheets use A and B for minor/major. (The A and B on the service sheet bears no relation to the letters reported by your car - makes sense ... huh?).
Use the MB electronic service sheet to figure what might be needed (it lists stuff to be checked/replaced based on age/mileage).