It's been recommended for years that all vehicles including Mercedes Benz vehicles needs to have their oiled changed every 3,000 miles which is still not a bad idea as it keeps the oil clean in your vehicles engine.
And having clean oil in the engine won't do no harm but will protect your vehicles engine and make the engine in the vehicle last longer.
But for vehicles of today including the Mercedes Benz you can wait until 10,000 miles before changing the oil on your Mercedes Benz or other vehicles.