No owners manual. He is currently changing the oil, as it is time.
Unfortunately, the guy driving it at the time of the stall did not mention an alarm.
I do not know where the oil leak was. The oil filter was very rusted, but I did not see any oil stains on it. The gasket on the oil filter also did not look like it was leaking.
My house generator will not start if the oil it too low. I was hoping that the WR has something similar.