“…It is important to point out that pure vegetable oils (VOs) can not be used directly in diesel engines because of the high viscosity, low volatility, and engine problems including coking on the injectors, carbon deposits, oil ring sticking, and thickening of the lubricating oils [4], [12].Yet, they can be used as base for liquid engine fuels in various ways, e.g. blends with other components, micro-emulsification, transesterification (TE), and hydrotreating [4].…”