At 15 years old it's like mine pre-facelift - which was 2011 model year. As you have a lot of paper invoices you can go through them and see whether the services done by the main dealer followed the A-B-A-B services at yearly intervals, they should also show whether the time related items I mentioned above were done. The fact that Assyst is showing a B service due, that would be right for a 2010 car as the next service after 2019 would be a B service, but had it been annually serviced between 2019 and now it would be due an A service in 2025 so maybe that has not happened after 2019 - not a major problem on a low mileage car - MB changed the C class service intervals in their favour when the 204 superceded the 203 (my first MB, an S203 C270). It went from 15.5k miles/2 years (whichever came first) to 15.5k miles/1 year - which I have ignored for the currently 13 years we've had ours! I do keep up with the oil/fuel/air and
cabin filters at 4 year intervals, and have the brake fluid checked every service and changed if there's any reason to, but I only get the car serviced - with OEM parts and fully synthetic MB spec oil - every 2 years, as we only do 6-7k miles pa. Mine came with a 1 year full warranty, so I had the supplying main dealer service it just before the warranty ran out, since when she's only been to indie specialists - currently £85+VAT ph compared to MB well north of £100+VAT ph!
If you have the Comand satnav system the last maps issued for NTG4 are 2018-19, there will not be any more, but at least the DVD's can be found second user
on Ebay and do not need a vehicle-specific PIN, unlike the NTG4.5 in the facelift car
B service is an A service with more inspections. An A service + MoT is more thorough than a B service.
The 5 denotes that the brake fluid and pollen filter should be changed . Transmission oil change is denoted by 7 after the letter.
