WOW that "Model R" is all copper, right?
There was oil leaking out of a drain plug in mine when I transported it, so that's how I knew there could be a problem. There is a big drain plug on the right, rear side of the spinner. It looks pretty much exactly like an oil drain plug on an oil pan of a car. I just filled the oil up to where it started to come back out. After that, it ran quieter.
I did figure out that the pump will always run, since it is directly hooked up to the belt/drive shaft of the motor. I have been leaving it on to recirculate the water, because I don't want it to run dry and possibly chew itself up.