I have a englander 13nc. I also live close to a railroad. I can walk the railroad for a couple of hundred yards and pick up a 5gal bucket or so of coal. Would it be detremental to throw a hand full of the stuff in with wood? Would i get a lot of oily residue inside the stove and pipe? It is not the cleaner burning kind but the black oily coal. I wasnt sure if it would all burn off or not. thanx all.