Several years ago, I purchased the vacuum pump type oil extractor as pictured in TedTheLed's post. I use it to change the oil in my boat's twin Mercruiser Ford 351 inboard engines. Over the years I have tried the drill pump types and the 12 volt electric pumps. They work, but they are a messy and a big hassle getting them primed and the oil flow started, and dealing with long stiff hoses. A friend let me use his vacuum pump type oil extrator, and it was a dream to use. I immediately purchased my own. It is now almost enjoyable to change oil. Believe me, if you are going to change your own oil, this is the way to go.