We warmed up the oil in the boat (about 1 beer since it was in the upper 30's that evening), inserted the pump hose, and it primed itself in seconds! All the oil was out in less than 1/4 of a beer! Seriously, it only took about 2-3 minutes to pump it dry. When we thought it was done, we moved the hose around quite a bit to see if we could find more oil, but it was empty. A little tip that my buddy taught me was to measure the length of the dipstick against the hose that you insert into the dipstick tube, then you will know approximately how far down until you hit oil. Obviously, you need to go further than that, but it gives you an idea about how far down you need to go. Super pump! Helpers were amazed too!