If you are using a bulk tank hose, you should turn it on and off at the tank. (I know this from Mr. Heater directly) due to the fact that propane leaches oil out of a rubber hose under pressure, and this can and will, clog your valve and regulator. I had to order and replace mine. Also, add an inline filter just before the heater, to prevent any further oil issues. They are a few bucks, and just screw in. They were right about the oil, and the new parts work as designed.
