Oil extractor

If you own a smart car, or at least a diesel, it's the only way to change the oil. Quick, easy and clean. The oil only gets changed once every 10K anyway but it makes for quick changes. There is no drain plug.

Boat engines are plumbed and designed to have the oil removed by some kind of pump or extractor. The dip stick is mounted to the oil pan at the drain location with a Banjo bolt. This enables the removal of anything that settles to the bottom of the pan. In a car or truck, the dipstick tube does not go to the bottom of the pan, and most are attached going through the block, several inches above the bottom of the pan. By using the extractor method in a car or truck, you will not be able to remove all the oil or any debris that has settled to the bottom.

I'm not sure how much you'd gain by doing an oil change like this. You have to crawl under the vehicle to replace the filter anyway. In my experience the filter is a messier job than draining the oil.

I used one for decades on my boats ,like previously stated oil must be hot because the hose is tiny.
Would never seriously consider using one if a drain plug was excessable

I have a little experience with them with boats. I'm not so keen on them. My biggest problem is the bad stuff like heavy metals and sludge tend to go to the bottom and a vacuum extractor does not get all of that.

My first question is why? Even with a boat, I eventually went with a trash bag oil change.

I use one similar to thisthisthis for my boat. Works well. Make sure you warm up the engine first.