- Joined
- Mar 12, 2005
- Messages
- 7,612
- Location
- Cheshire, UK
- Car
- C270CDi Estate (late 2004 facelift model) - Bought 2005, Sold 2022.
No. The plug change is not part of a service. It is done at a set mileage like, say, 50k. If you get that done, and then go for a service at say 53k, they would and should stamp the book.
They're not part of "a service", but they are part of the service schedule. Your not meant to rush to the dealer and get additional work done as it arises (ie at 50K in your eaxample). The idea is that all the additional work is carried out at the next scheduled service. So if you don't have the work done that the schedule calls for then the dealer could, quite rightly, say the car hasn't been fully serviced.
Whether they would take into account a plug change done outside the network probably varies person by person, but they could quite legitimately say no. To extend your argument, why not get all the work done somewhere else and then ask MB just to do the checks and stamp the book?