 The most favorable way to transform this waste plastic into HDPE Pyrolysis oil is by pyrolysis process. The waste plastic can be used to produce waste WPO and it can be used as an alternative fuel because waste plastic oil and diesel have mostly similar carbon chain characteristics and physical properties. In this study certain parameters such as % biodiesel, Injection Pressure and load are considered as the variables for optimization. Hence continuous optimization is required for these three parameters we have used Taguchi’s Method of optimization. The optimum set of parameters which are obtained from Taguchi’s method shows that 0%- Biodiesel, IP – 200, 0- Load which gives the lowest Carbon Mono-oxide (CO), 100%- Biodiesel, 220– IP, 0- Load which gives lowest NOx and 0%- Biodiesel, 180 – IP and 0 –Load which gives HC. From the experiment performed the experimental value and predicted value are very closer.

HDPE Pyrolysis oil, Taguchi Method, Mechanical efficiency, Break Thermal Efficiency, Carbon Mono-oxide (CO), Nitrogen Oxide (NOx),