Coconut oil is one of the biofuels, which remains a white crystalline solid at temperature below 20 °C, but it is a clear liquid when it is blended with OD fuel. The fraction of coconut oil in blends does not create any separation or any layer on the inside wall of the fuel tank. It should also be mentioned that this investigation was done in Malaysia, where the ambient environmental temperature is 23 to 33 °C. As a result, the possible cold temperature, fuel filter problems and the blocking of the injection line have been avoided.