I alway change my own oil. I bought a topsider and have used it quite a bit the last couple of years. I just changed the oil and filter in the ML and refilled with 7 US qts. Drove around so the engine heated to operating temp, parked on level ground, cut engine off and waited 5 minutes. Checked the oil level via dipstick and it showed to be only about .5 quarts low from the MAX mark. What gives? I thought the MB preferred method for changing oil was to extract via the top but it seems there must be old oil in there as I only added 7 US quarts?