Hi. I've got one of those extractors -- it's a 12 volt pump on the lid of a large (4 or 5 gallon, I can't remember) bucket, made for the boating market. I use it regularly to service the engines, hydraulic systems, etc., on my boats. In addition, I have had three Mercedes cars (two with M103 engines, and one that I still have with an older M110 engine) that I used this extractor on as well -- MB engines are particularly made for this method of extraction (the dip stick tube goes all the way to the bottom of the sump), as it's the regular servicing method at M-B dealerships, as well as in boat shops (because you can't easily reach drain plugs on inboard engines. The pump (it's a "Shur-Flo" brand, about $150 from WestWest Marine and other boating stores) is, needless to say, very effective, clean, convenient and time-saving in these boating and Mercedes-Benz car applications.

However, for Volvos, I've tried in vain to use it not only on a B30 (164) I used to have, but also on my three red-block engined 240s (B23 and B230s) -- it just doesn't work. Sometimes I can snake the tube into the sump, and sometimes I can't (I'm bewildered why it varies, but maybe it's a crankshaft position). And even when I can, it doesn't get all the oil -- if I afterward open the sump plug, more oil spills out.

Bottom line -- I wouldn't consider that it reliably drains all the oil on Volvo engines, especially compared to using it on boat and M-B engines. And it's too bad, because it would be a really great thing.

Sorry for the bad news.