i took an oil can and cut a hole in the top, and i (one at a time of course) put my old oil cans in the hole for 24 hours. after 4 oil cans were done, i had 4 ounces of extra oil! heres a picure. this is my first design, years ago i saw at a rebuild shop a pcv pipe slanted slightly downward, with a number of holes drilled in the top. one end of the pipe was capped off, and the other end went to a quart sized oil bottle. this seemed like a cool thing to do, as its basically free oil. i got 4 extra ounces out of my kendall nitro gt 70wt oil, with only 4 bottles used. i wonder how many gallons of good oil are thrown away ach year by people in a hurry? well this seems like a good answer. btw, thats straight 70 wt oil, non api approved, actually no one has approved it for anything. i use it in my sandrail.