I have an extractor. Only used it once, but so far not a fan. 2 issues for me - first, how do you know that the tube is correctly inserted and not over/under inserted? In my case, I think it was overinserted and curled up higher than the floor of the oil pan, so not all the old oil was evacuated. Since there is no way to tell that this has happened, I put in the quantity of oil specified in the manual, then checked my dipstick and found the level was WAY higher than max and had to suck some out.
The other issue is, it really wasn't all that convenient or fast. My standard oil change procedure is the drive onto ramps, put on latex gloves, drop the drainplug and filter, go inside for a beer, decide the beer was pretty good and have a second beer, then reinstall plug and filter. With the vac you get to skip the ramps, but the process requires more manual intervention. Stick the tube in the dipstick, pull a vacuum, confirm that it has (slowly) started doing it's sucky-sucky on the oil, then head in for a beer. Then come out, the vacuum is depleted, there is some oil in the sucker, but is it ALL there? Better be safe, pull a vacuum again. Yup, it's still sucking some more oil out. Check again in 10 minutes. Pull a vacuum again, yup more oil.
In my (one) experience so far, it is slower, less convenient, and less reliable than good ol' gravity. And, you still have to store the sucker somewhere. Once my Audicare expires (I prefer to change every 5k) I will probably change over to a fumoto valve, and have an aircraft sheet metal mechanic I know add a nice access door in the underbody tray so that I don't have to remove it to get to the oil pan. Similar to this but more awesome.
http://www.bokchoys.com/differential...res/oil_09.jpg
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