I had a chat with an owner of a 2024 Leisure Travel Van with a 2.0 MB Turbo. He said the oil change interval is 20,000 miles, and the crankcase takes 10-11 quarts, and that the oil changes "have" to be done at the dealership at approximately $1000 per change. I asked why it costs that much, and the answer was that the oil had to be drained from various parts of the engine compartment. Is this true? My VW Mk7 TDI takes 5 quarts and it has an old fashioned drain plug. Does the MB have an oil cooler and if so is this where it needs to be drained in addition to the crankcase?