service C

[Treborgonzo]

further to my last thread relating to assyst showing my car not due for a service for 3000 miles although it is over 12 months since last service (E270 2003 model), the car has suddenly displayed "service C due in 30 days" - anybody tell me what service C involves as its not mentioned in my service manual

Thanks

 

[alfiestock]

My 04 E55 also showed C service due early, Assyst counted down till 16 days to go but after going on 120 miles continual journey, I have found that Assyst has stopped warning that service C is due?