The present study aims at investigating the friction and wear characteristics by blending zinc diakyldithio phosphates(ZDDP)with pongamia oil methyl ester as lubricant under various loading conditions and temperatures. Coefficient of friction and wear scar depth were determined using pongamia biodieselblended with 0.3%, 0.6% and 1 % ZDDP by concentration through high frequency reciprocating wear testing machine for 2 hrs duration. The reciprocating wear tests were performed on an engine liner-piston ring contact for various loads of 40N, 60N and 80 N for 2 hrs duration at temperatures of 100C, 125C 150C with 10 Hz oscillation frequency as per ASTM G181, 11. The addition of ZDDP with pongamia bio-lubricant showed marginal reduction in friction coefficient and wear scar depth under all loads and temperatures. Coefficient of friction was found to be higher in the initial stages due to running-in for all testing conditions. In addition, SEM images of tested specimens were also examined. The presence of deep grooves at certain locations on specimens was observed that might have caused due to simultaneous effect of fatigue and adhesive wear. Furthermore, addition of ZDDP with pongamia biodiesel has not affected the formation of an antiwear tribofilm.