Or though they are to phase out drain plugs, I believe yours still has one.
It can be drained via plug or suction, however more oil is removed via suction than draining.
Also keep in mind the Flexible service system on your vehicle. Via a sensor in the oil pan the system can tell when oil change is due, basically dont worry about it. As for sludge, you should not have any on a car as new as yours.
Mercedes-Benz Master Guild - 2 years
Shop Foreman - 20 + years - dealer.
Part owner - MBZ Transmission remanufacture