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Diesel engines, unlike their petrol counterparts, are omnivorous in fuel consumption habits and can easily run on vegetable oils without any major changes in the engine. Using raw oils in diesel engines led to such problems as the sticking of fuel injectors and piston rings due to choking, and the thickening of lubricating oils, resulting in clogging of fi lters, but these were overcome in a large measure by pre-conditioning of the fuel by a chemical process using methanol or ethanol calleddoi:10.3126/hn.v5i0.2494 fatcat:pvay2bqkl5gn3gebzwmmdw4akq