I've used one called "Suck Up" for years, works great. If the oil is hot it will "suck up" 2 gallons of oil without having to pump up the vacuum at all. Has a nice pour spout for dumping the used oil too. Looks like a garden sprayer, plastic so it doesn't rust, heavy duty. I'd buy another one if this ever quits working.
SV Laurie Anne
1988 Brewer 40 Pilothouse