Just bought my first Merc:- January 98 SLK 230 with 28000 miles in great condition. Up to now it's services have been carried out at MB dealers. I have been quoted £200 & £400 for the 2 types of services. I can carry out basic servicing (oil/filters/breaks /suspension) myself . At the age of the car would it reduce the car value by a significant amount if I decide to do my own work or have it done by an independant garage instead of carrying on with a full dealership service record.