The present rate of consumption of GASOLINE would lead to a severe shortage of it within a further few decades. An urgency of finding an alternative fuel in its place has led to several types of research around the world. A study was carried out to evaluate the use of various TYRE PYROLYSIS OIL (TPO) blends with diesel fuel. Performance and emission characteristics of TPO blends with diesel on a single-cylinder direct-injection engine are presented in this study. In the initial stage, the test was conducted on four strokes single-cylinder diesel engines by using diesel and baseline data was generated. A constant speed will be maintained throughout the experiment. Then commercially available TPO was blended with diesel fuel at some volumetric ratios [(5% TPO ,95% DO) (10% TPO ,90%DO) (15% TPO ,85%DO) (20% TPO ,80%DO) (25% TPO ,75%DO) (30%TPO, 70%DO) (35% TPO ,65%DO) (40%TPO ,60%DO)] which will be going to give the performance characteristics and also to assess at what volumetric ratio the indicated thermal efficiency will be maximum and ISFC will be less when compared to only diesel blends. How will be the exhaust gas emissions which will be studied here, if the emissions are more then we will add some additives to decrease the emissions in further work.