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In this present study oxidation stability of sapota oil methyl ester with   synthetic and natural antioxidant additives using Rancimat test is   investigate. The performance and emission characteristics of the B20 blend of   sapota oil methyl ester with different antioxidant additive are evaluated in   a Diesel engine. The natural antioxidants namely citric acid, rosemary   extract and leaf extract and synthetic antioxidants namely pyrogallol, propyl   gallate and butylated hydroxylanisole are selected. Addition of all the   antioxidant additive found to have improved the oxidation stability of the   biodiesel to the required level. Pyrogallol is found to be the best among the   synthetic antioxidant, while leaf extract is the best among the natural   antioxidant. From the emission test it is found that B20 has better emission   characters compared to diesel except NOx. Further the addition of leaf   extract slightly reduces the NOx emission of B20 and appreciably suppresses   smoke emission

The influence of natural and synthetic antioxidant on oxidation stability and emission of sapota oil methyl ester as fuel in CI engine