Abstract
This study assesses the fuel properties and potential engine compatibility of biodiesel synthesized from tigernut and sugar apple oils via transesterification using a CaO catalyst. Physicochemical properties such as density, viscosity, flash point, pour point, cloud point, acid value, and cetane number were analyzed following ASTM D6751 standards. GC-MS and FTIR confirmed successful biodiesel conversion and FAME composition. The results indicate that the produced biodiesel meets international fuel standards and can be used as a sustainable alternative to fossil diesel in compression ignition engines.