I finally installed a sump guard. I ordered the SW Motech guard. I don't relish the idea of removing this thing every time I do an oil change, and since I still have the old-style oil pan with the bottom-mounted drain plug it was easy to modify the SW Motech piece. I mounted the guard temporarily to mark the oil plug location, and then drilled a small pilot hole in the pan. After refitting I found I was off by 5mm, so I repositioned the guard on the drill press and used a Unibit to drill a 1 1/8