2010 E550W4 82K miles thoughts
It is a nice car, drives smooth, gets decent mpg and can be reliable if you take care of it. 550s also are equipped better so that's another plus IMO. Good luck with your purchase!
I would check the following-Airmatic as mentioned above
and the engine mounts and trans mounts - those seem to go about 100K ish...
if you do it yourself - parts are about 3-400 ish. if the dealer does it...prob about 1G
I replaced the battery in both of mine with AGM Sears Gold - (the best they had) for much better cranking.
Other than that - I expect to keep my E-4M for as long as I can!
Good luck!
Cheers
JPC




- The rear air springs were replaced soon after I got the cat in 2012.
- I had the center brake light replace is search of rattle source. Nothing was wrong with the light and new one did not help with rattles.
- Had the fuel door lock replaced also for rattles and this did help some.
- My car has dropped down in rear twice while parked over night when I left it in Sports mode. It has not dropped down in Comfort mode which is weird. This tells me it is not a leak in the air spring or air tubes to the springs as it would drop regardless of the mode I leave it in. Must be the valve unit issue but have not looked into this yet as the car raises up very quickly after start-up.






