I've forgotten about this column so here is an update "mart" may find helpful. I'd forgot my p.w. and just got it reset! I get most of my oil where I work as a heavy equipment mechanic, some from a friend who has excavating equipment. I burn only oil drained from a gas engine, transmission fluid, or hydraulic oil. Trans fluid and hyd oil burn very well. I do not like diesel engine oil as it has soot in it, is messy and thicker. Definitely no heavy gear oil. I am burning my stove now. The pot in the stove does need to be cleaned out after 7-10 gal of oil is burned. It gets an ash deposit in it that must be broken up and removed, similar to a "clinker". I use an old shop vac with a truck air filter in it to vacuum it out after breaking up the ash, wire-brushing the burner. Only takes about 10 minutes to clean it, pour in a 1/3 cup fuel oil, throw in a piece of paper towel that wicks up the fuel oil and light it. Adjust the flow control as desired and enjoy free heat! I did have to slightly modify the metering rod for the heavier oil. This set-up works well for me as I have used it almost 30 yrs now. It has its finical things to fuss with but is not difficult if you understand how it works. If anyone is interested I could try and include some pics if I can figure out how to post them as I'm not real computer savvy. I also used a "Siegler" oil heater that I modified a little. It had an electric blower on it. I had it set up with two oil controls, one for fuel oil and one for used oil. I probably like the Frogil stove better as it needs no electric.