I have heard all the arguments in favor of the pump method, but you will never convince me that it actually gets all the crud that settles to the bottom of the oil pan. Gravity will have its way despite nature abhorring a vacuum. And how does one clean the metal particles that appear on the magnetic portion of the drain plug? Believe me, my Geezer body complains loudly every time I jack-up a car and crawl under it! However. I also assert that if one is not inspecting the underside of one's car, then one better be paying someone else to do it regularly. Or, as the old commercial goes "Pay me now, or pay me later." Someone will be under your car after things go "CLUNK" in the night. And it will likely cost you more than if you had caught it earlier.