investigated after addition of ethanol, butanol and diethyl ether. The results revealed varying improvement in acid value, density … viscosity reductions at 5% additive were 12%, 7%, 16.5% for ethanol, butanol and diethyl ether, respectively, and the maximum … reduction in pour point was 5 °C at 5% diethyl ether blend. Engine test results revealed a noticeable improvement in engine …