Been a while since I've been on and active, just been super busy with school and work. Any way, my 2000 Sierra with the 5.3 had the normal leak coming from right above the filter. It has been seeming to get worse. I stopped at Autozone to get a new caliper and saw this stuff and decided to try it out. The stuff seems to have stopped the leak. I've put well 500 miles since putting the stuff in and still no fresh oil on the filter or the pan. I just thought I'd let yall know of my experience with the stuff.