Croton Nuts (IMAGE) Penn State Caption Croton nuts are the source of an oil that can power generators, water pumps and other internal combustion engines and, with processing, can be used in place of diesel fuel in cars and trucks. Credit Eco Fuels Kenya Usage Restrictions non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.