I'm about to schedule a service appointment for my '13 X166 (bought at 80k mi, now at 125k). I just want the dealer to look it over and check for yet-to-be-revealed common problems with this model.

For those with X166's with around the same mileage, what problems have you encountered that you wish someone would have told you to check before they became an issue? Share them here so I can tell the dealer to check for them during my service appointment (please!)

 

Diesel or petrol?

 

Oops, yeah, that would probably be helpful huh? petrol! GL 550.

 

Air suspension: struts, compressor and valve block
Engine cylinder scuffing
Oil in engine harness from cam sensors and cam magnets
Turbo oil leaks
Transmission service is a must

 

I would also change transfer case and f+r differential fluids. I don’t believe the schedule calls for those.

 

Hello, any one notice a clunk in ya drive train when you pull had off the line?

 

Probably worn engine / trans mounts. Not unexpected at that mileage. Cheap parts + expensive labor.

 

My 2013 has had half a dozen coolant leaks throughout the cooling system. Lots of plastic pieces and hoses that fail.

 

I would pre-emptively replace the CPS as stated above, cheap insurance.
I would have someone else check for scuffing. I had my local dealer scope mine, tell me it was scuffed in 5. The engine was completely rebuilt and 5 was completely fine, a couple others were destroyed, but he clearly lied.

 

Is your auxiliary battery original? If you haven't changed it, I would do that now. You can do it yourself cheap and easy. Also, I'd look really close for dried coolant around all the coolant line fittings, I've found a couple that I fixed before they got big enough to strand me.
Please let us know what the dealer found and what service they performed, I'm almost at that my mileage on mine. I had my transmission serviced at 100k.