Dealership did not perform oil change?
I brought my car into a local dealership for an oil change 2 days ago. The last oil change was performed just over a year ago approximately 7000 miles since the oil was last changed. When I brought the car in, the oil showed that there was 75% oil remaining. I picked up the car yesterday and it still showed 75%. Today, after driving 40 miles the oil level now shows its at 50%. I purchased the car used about 8 months ago and this was the first time bringing the car in for maintenance. This does not seem normal and I feel that the dealership did not change the oil. Any thoughts?