I just joined the forum and I would like to know what a "C" service is for a 2003 E320? Thanks

 

Do it yourself.
mile based service you can look up on your service menu on the dash
visit the w211 section on benzworld.org or mbworld.org
mostly inspections and an oil change.mb spec mobil 1 0w40 syn diy on mercedesshop.com oil and filter change.you can reset the interval when done.
ohlord

 

Thanks for the information. I will visit the sites you mentioned and post my progress.