Nightscar is right,
I'm fortunate that I have free servicing due to my company having an agreement with MB Australia.
But, I changed the oil after 2,200 kms as I'm not comfortable between long service intervals and I track race my Car.
Maintenance is nothing when you consider just a filter and recommended oil.
And on the subject of Mercedes Benz engines breaking...
You have to be kidding..this is 2015 give MB credit when building such cars, they are well engineered.
They take into account people like myself that will do track days that will hit the rev limiter and will be changing gear
At high revs ...on the road yours be hard pressed to break anything but your driving licence.
Here In Australia the resale value is very high,.( I was offered $10k cash not to by mine..on the day) .
Some people are happy not to wait ( also mines fully kitted edition 1).
If you get a good price go for it as they are amazing vehicles.. I've never driven mine out of manual mode!
As I like control of my vehicle but in truth the AMG exhaust is addictive.
On the subject of rattles I paid extra for the AMG track suspension and yes it will get shaken but you can't have it all.
It may say SUV for the U.S. Market but it's not a Cadillac Escalade ( fortunate to have owned one).
It's a very acceptable purchase whether gla 250 or. 45
Enjoy either way..Enjoy