^ I didn't use a pump and there is not enough room to put the bottle into the fill hole, so I used a 6' plastic tube. I inserted one end of the tube into the fill hole and attached the other to the nozzle on the gear oil bottle. Then I held the bottle upside down and squeezed it until empty...continuing with more bottles until level with the fill hole. Works great
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You could use a pump but it didn't seem necessary to buy if I didn't already have one laying around.