There are differences by countries. Our Mercedes dealer don't knows much about W107 to guarantee a good service, only some mechanics do. But that's because they don't like servicing cars, that's older than ~7 years... our specifics... Hope, your dealer are ready to work with Mercedes of any age! Otherwise try to get information from internet and find Your own mechanic, like doctor for Yourself -- that's the only guarantee to get the best service for Your SLC!