Crude, degummed and degummed-dewaxed sunflower oils, as well as crude, degummed and alkali refined cottonseed oils, were tested using a single-cylinder precombustion chamber engine (Engler et al., 1983). The results were negative. The processed oils which were slightly better than crude oils were not suitable for use as alternative fuels, even though they performed satisfactorily for a short time. The oils were not suitable because of carbon deposits and lubricating oil fouling.