In the present work, an attempt has made to study the performance and emission characteristics of four stroke indirect injection diesel engines using diesel-UTO blends for varying loads. The experiments are repeated using diesel-UTO blends. The obtained results are compared with that of pure diesel. It is found that there is no much variations in the performance characteristics but the harmful emissions were comparatively reduced. Also, it is noted that there is significant reduction in the NOx emissions. It is clear that the use of diesel-UTO blends can reduce the NOx emissions and no much variations seen in the other emissions.