I have thought about buying one of those Liquvac systems, but can't get away from the thought of not getting all the oil out. Also I would imagine it would be faster to drain the oil than to draw it out through a tube. I have used a siphon pump to change the power steering fluid and that took about 2 or so minutes. However that was only about a quart, imagine how long it would take to suck out 2 gallons of oil, especially if the hose does collapses on you, slowing things down. I think I'll stick with the hot drain method. This will give me a chance to do a look around.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section