I have used a Mityvac 7300 PneumatiVac Air-Operated Fluid Evacuator for more than 15 years. Part of that time it was used very successfully on a 1998 Camry V6. This particular extractor is designed to be attached to an external air compressor to generate suction. Even the smallest air compressor works fine. I have found that extractors that require hand pumping do not work well, and sometimes do not work at all:
Using a fluid extractor can be a little tricky since the long plastic tube that is inserted down into the dipstick tube can get caught up on an engine part before reaching down into the bottom of the oil pan. This requires that the tube be twisted 180 degrees and inserted with more force, since the plastic tube has a natural curl in it. Sometimes doing this with the engine still very warm helps, because the plastic tube becomes more pliable went hot.
Another problem may occur when the natural curl of the plastic tube causes it hit the bottom of the oil pan, but curl back up so the tip of the plastic tube is now above the oil level, and no oil is extracted. If this happens, it usually works to very slowly remove the tube until oil starts flowing, which will alert one that this is the reason for no oil being extracted upon initial insertion of the tube. Over time, the plastic tube usually loses its curl, especially if used on very warm or hot engine.
Removing oil with an extractor is the way almost all MB and BMW vehicles get oil their changed at a dealer, although they have more sophisticated fluid extractors that work fast than the one above. I have gotten excellent results using the Mityvac 7300, especially in getting they last drops of oil from the pan, if I keep moving the tube around so I am scrapping the bottom of the oil pan in different locations toward the end of the process. I almost always get more oil out that way than using the drain plug, because the drain plug is usually not at the absolute lowest point of the pan, due to metal ridges or reinforcements of the oil pan and drain plug thread design.