This research aims to determine whether plastic oil can be used as an alternative fuel and also to know the influence of plastic oil mixture denagan premium, pertalite and also pertamax to exhaust gas emission performance This research is to know the level of exhaust emission of HC and CO by using gas analyzer. The results of this research is known that the premium mixed with 10% plastic oil decreased by 606 ppm HC and CO decreased by 1.24%, for which the 15% mixture decreased HC by 701 ppm and CO by 1.3% from pure premium which was tested. Denagan fuel type pertalite with 10% composition of HC gas plastic oil decreased by 408 ppm and CO 0.97%, for the composition of 15% decreased HC gas by 915ppm and CO gas decreased by 3.04% from pure in test. For the mixed pertamax fuel 10% of HC gas plastic oil decreased by 139 ppm for CO by 0.33% and the 15% mix decreased by 398 ppm in HC gas 0.93% in CO gas of pertamax under test.