Having gone thru two advertised 12 volt oil removal
pumps, as well as hand pumps, I am currently using a 12 Volt 300 Watt DC Utility Pump from HF.
Instead of a rubber impeller, it has four plastic blades that fit into a bun. Not sure what material the bun made from, although replacement parts
So far I have used this pump only a few times on both engine
oil. I do not clean out the pump after each use (months apart), accordingly, I believe the impeller is not damaged by the residual oil.
The pump removes the oil very quickly, and to store the device, I seal off any drainage by connecting both inlet and outlet hoses to each other.
PLEASE BE AWARE OF THE FOLLOWING TWO CAVEATS:
According to the pump manual:
1. "The Pump is designed for use with water
with a maximum temperature of 140° F (60°C). Do not use the pump for other fluids, especially not fuels, cleaning
fluids, or other chemical products."
2. "Do not allow the utility pump to run dry. Fill the pump with liquid before operation. Failing to do so may damage the seal ring (19), which depends on the liquid for its lubrication."
However, since I can't read, along with others who successfully use this pump for fluids other than water, I guess
I'm OK. Incidentally, because the pump is so close to the oil source , and I tend to leave some oil in it, I haven't found a need to prime it, although it wouldn't hurt to squirt some oil in the intake port prior to the first use. Again, I guess my unorthodox approach to certain things are a part of my reading deficiency.