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Blending pyrolitic oil (or Waste Plastic Disposal) produced from household and industrial plastic wastes with Marine Heavy Fuel Oil (C.Oil) reduces the viscosity of the heavy oil significantly. The experimental results indicated that, the WPD mixing ratio of 20 vol.% reduces the experimental heavy fuel oil viscosity 90% from 177 cSt to 20 cSt at 50°C. The blended oil has been applied to a small size high-speed single-acting 4 stroke diesel engine (16 horsepower, 2,200rpm) without preheating the oil. However, NOx emission slightly increases so that the WPD emulsified fuel oil has been tested with the aid of capsule-typed additives. The experimental WPD emulsified fuel oil (WPD Emulsified F.O) of 10 and 20 vol.% water and 0.3 vol.% additives indicates stability and helps reduce NOx emission by 30 and 50%.