Just though I'd update everyone on what happened. I found the cause of the black oil. after the furnace wouldn't fire and would go to lockout, I called in a HVAC friend, said it needed a new nozzle. I let him change it and told him to do the fuel filter also since I missed a year. When he pulled the filter apart, there was no filter left except for the center screen, see a picture of a "general 1A-30" if interested. The felt filtering material looked like some kind of sludge. Neither myself or my tech have ever seen a filter deteriorate in just 2 years. Anyway after a new filter, new nozzle, and fire eye, the system is back running.
now to restock the woodpile.