They're trying to keep DIYers away, so the required wrench is 7mm inhex (allen).

Working on a Mercedes without reference to official repair procedures is a big risk and IMHO not smart.

http://www.startekinfo.com/StarTek/outside/11498/?requestedDocId=11498

__________________
Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles