They are in the service booklet that came with your car.
If you do not have the service book, register at the Mercedes Benz site and they should have it. You can also call 1-800-FOR-MERC and they can send you one. The intervals can be found online but it is nice to have the book to keep notes in.
BenzWorld.org forum is one of the largest Mercedes-Benz owner websites offering the most comprehensive collection of Mercedes-Benz information anywhere in the world. The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more!