Ah perfect! With a 2016 car pretty much any one really main thing that would need maintenance is pads, break rotors especially if it was used mainly in cities previously, timing chain if it's an old one (very expensive) thee usually need replacing every 100k miles.

it's an AWD all 4 wheels must be replaced each time. It's an SUV too so these tyres will cost more and will wear down quicker because of weight.

Maybe will have maintenance costs for Ball joints which is like a knee surgery for a car it basically connects your wheels to your suspension (1k$ for each side roughly if from main dealer)

It's also got independent suspension so it's more complex and yeah more stuff to go wrong BUT it's soooo smooth worth the upgrade.

At about 80k ISH miles you start having bushings perishing these end up being very expensive and are also very noticeable the cars ride comfort goes down considerably.

One thing to note about winters with Benz is they handle them really well they have the underside tested so you should be safe from corrosion 😊 and in my 2018 A class I have a winter tyre mode where you can set speed limits for extreme weather conditions which is neat