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Vegetable oils and its esters are being considered seriously for internal combustion engines. It has many advantages such as it is renewable, nontoxic, sulphur free and biodegradable. But there are several problems associated with its use in diesel engines such as lower thermal efficiency and higher smoke levels compared to diesel. One of the methods by which these problems can be tackled is by blending of diesel (DSL) with biodiesels. In this work coconut oil biodiesel and castor oil biodiesel which are obtained from different sources are chosen, considering the wide variation in properties such as viscosity and degree of unsaturation. For coconut oil biodiesel (COBD) and castor oil biodiesel (CSBD), iodine value, which is an indication of the degree of unsaturation, was determined experimentally. The property influence on the performance of COBD and CSBD and its blends with equal volume with diesel was studied.