When I first stepped away from my shops I did my own oil changes and then I got lazy and went to an oil change quick lube shop for one. They left the old oil filter seal stuck to the block and spun on a new one. I went to leave the place and saw a puddle of oil under my rig in the parking lot. I, not them, pulled it back in the shop and knew what it was right away. Needless to say, it was fixed, I got my money back and told them, "oil changes are easy, if they are done right". I supply the oil and filter and had been taking to my independent shop till I recently purchased tools again and will be doing it all myself. Those quick lube shops are full of "wanna be techs" that pay more attention to cell phones than the task at hand.