I didn't realize there was such a thing as an oil pump until I decided in August that I would winterize my wakeboard boat with an inboard Indmar engine.  Of course, there is no hole in the bottom of the boat so how do I drain the oil.  Well, I considered this Hydro-Turf product along with 2-3 more expensive brands and gambled on this one since I would only use it once a year.  Well, this pump worked so well, that I used it on my Yamaha jet ski and my Yamaha ATV.  Using it on the ATV saved the need to remove the shield under the engine.  Admittedly, the pump is very slow, but they all are since the hose must fit, in most cases, down the dip stick shaft.  Highly recommended product.  Also, I was able to drain ALL the 5+ quarts of oil from the Indmar engine with one extraction cycle.