Yesterday I flew into a one of my regular western MD destinations. As I was pulling up to my plane with the courtesy truck, I saw the line guy motioning to a woman who was walking away from from a Cirrus SR20 with 3 empty quarts of aeroshell 100 in her hands. He was telling her to throw the empties in the bed of the truck. I then saw a man who turned out to be the pilot holding a 4th empty. I half jokingly asked him if his airplane had taken 4qts of oil, expecting him to say that he had been col