How long will cheap oil transfer pump survive pumping water?

I'm hoping someone else might used one of these to pump water. I can get a 12 volt pump for $25 and need it to live for maybe 2 hours. The pump instructions all say the oil being pumped is what keeps the pump lubricated. I'm trying some backwoods engineering to run an antique tractor in a parade tomorrow. The radiator is peeing out the bottom and no luck with Barrs. I've rigged a catch bucket but would like a way to pump the water back into the radiator while on the move. I'm running straight water and the cooling system holds 11 gallons and is non-pressurized. Thanks for any thoughts. I know this sounds like an UTG episode