Coming close to 40,000 miles and curious about the recommended service needed

Please go to the mercedes dealer and get a service book for that car.
these cars are very car specific and needs to be followed car by car only.
every car is different.
the service needed is not that much right now.
as 40,000 is low miles for this car.
do not go long on the service intervals.
and allways have the engine oil serviced sooner.the cleaner the oil the longer the engine life.
look in the glove box for the owners manuels.
it should be in a black leather binder with a zipper.
all scheduled service is in this leather binder.
if not go right to the dealer and ask them were it is.it very well maybe on the sales reps desk.

hope this helps.
thank you
jm