If you want to pump WMO with very little pumping hassle build a vacume tank system.
You will need a tank capable of holding presssure/ vacume, a air compressor, hoses and some ball valves. [I use an old air tank, the kind you can carry, picked it up at a swap meet for $5]
Connect the air compressor intake side to the tank. Put a ball valve at that connection and a vacume/pressure gage so you know what vacume/ pressure you have in the tank. Connect the oil collection hose to the tank. Put a ball valve at the tank connection. [With a bigger tank, and good supply
of vacume you can use a 1 inch pickup hose.. you get LOTS of oil fast]
Start the compressor, draw a vacume on the tank. Close the ball valve on the compressor , shut off the compressor. Insert the pickup hose in the WMO, open the ball valve and suck a tank full of WMO. When the vacume tank is full, close the ball valve on pickup.
Now switch the intake hose on the compressor to the pressure side and pressurize the tank of WMO with about 10/20 PSI. Put the pickup hose into the 55 gallon barrel or tote and open the ball valve. The WMO will come squirting out the pick up hose so hang on to it.
Repeat as necessary until you have collected all the WMO you want...
Very little fuss, no pump that pumps slow, and the compressor can be a 12 volt one you pick up for cheap... it just has to draw about 10 / 20 PSI vacume and make 10/20 psi pressure on the tank....and you can get lots of oil fast without a lot of mess.