I have 160k on mine, and I've never lost a drop. I also measure it very carefuly because I think it will help me determine a problem early. the only time I ever had less than 6 was when I had to have jiffy lube change it, and they only put 5 quarts in it. I also never go any longer than about 3500 miles in between. I live on a dusty road, so I figure I have to.
