Mercedes GL450 120k Maintenance

 The GL450 is now past 120k miles (123k) and due for a few maintenance items.  I recently replaced the front brake pads for the first time.  My E350 also went 120k before needing front pads.  Here are the new versus old pads showing wear.

I let them go long enough it also took out the wear sensor (which is cheap to replace).

I replaced the spark plugs too.  This required a special 14mm thin-wall 12-point wobble socket.  

When working on a Mercedes, you will need a set of reverse torx sockets and wrenches too. 

I also replaced the accessory belt. 

The belt appeared to be in great condition.  No cracks or visible wear at all.  My E350 belt was like that too.  But at 120k miles it seems like a good idea to just replace it anyway as they are not expensive, even through Mercedes.

As I was replacing the belt, I broke 2 plastic coolant tubes.

Overflow Tube

These were about $130 each and in stock at the local dealer since they often get broken.  The overflow tube in the bottom photo broke very easily.  

I change the oil using the oil reminder in the display.