I just had the oil changed (maybe) in my 2015 Chevy Malibu with 43K miles on it at the shop. I supplied my own oil and filter. Oil was Mobil 1 full synthetic 5W-20. I drove it 7 miles home and checked the oil to see if it was full. I noticed that the oil was much darker than when I had changed it myself. When I have changed it myself before, the oil would be almost clear on a paper towel with just a slight tint of brown. This oil is much darker. Can oil change colors that fast or did the shop simply not change it? I attached a picture. Thanks for your help.