been doin it myself for quite some time now,,,,i too filter it first and am quite picky on where i get mine,,,if i dont know whats in it i wont use it,,then i put a lil bit of vegetable oil in it,,,,exhaust doesnt smell then,,,also a lil additive here and there,,,which is some anti gel and cetane booster and jus a tad of acetone,,,,seems to run a hellava lot better,,,,have run bout 50% in summer but am bout 25%now,,,,,fires right up ,,,,even when it was 26 f below las week,,,,but i plug it in in the morning for bout an hour before i start it,:thup: