WARNING: This page is about a different car, the 2009 Mercedes-Benz E550 and 2008 Mercedes-Benz E550. However, it is still accessible from the selected car via links, so may be relevant.
FG 05/Set C
ENGINE all
Use/specification:
20 mm cylinder brush for cleaning valve guide and valve guide base bore
Fig 1: Cleaning Valve Guide And Valve Guide Base Bore