Me too. I used to put a scratch on the oil filter so I could tell if it's been changed before. Why would I do that? Because once I paid for an oil change and when I looked, the filter was dirty and splashed with water, implying not changed. As recent as 2012, i caught a GMC dealer putting in Dexos when I paid for Mobil 1--they accidentally stapled an internal work order to my receipt. since then? Never again has any dealership changed my oil, and these are dealers, not Midas. I also think if you take the car somewhere, don't you have to wait for it? Well not with some luxury cars I get it you get a loaner. But if you have to wait, may as well just spend that time DIY. I actually like changing the oil, I get to see what condition my car is in by getting under it...Even being an old guy I'm so glad I live where I can do my car maintenance. Helps me sleep better at night.