Hyundai Harbor View

Car owners,how many of us inspect engine oil in our cars after a service at the deaership. I had an experience with my cars first service at Hyundai Harbor View. I inspected my cars engine oil before service obviously the oil was a very dark brown/black color. A day after the service the color was exactly the same as if the oil was never changed. No proof because we the customers are not allowed in the workshop. The `free' carwash literally looks like the car had a 'free' carwash.