This study examines the relationships found in supplier involvement in the course of operational life-cycle stages, environmentally-friendly practices, and environmental performances. Using sampling data gathered from 157 managers of automotive firms,obtained via a benchmarking questionnaire, three hypotheses are tested employing a Structural Equation Modeling analysis. The findings are generally consistent with the literature, with three hypotheses supported. In addition, this study explores the criteria of selecting or assessing alternative green suppliers. The major contribution of this research lies in its suggestions for decision makers to improve environmental performance using green supply chains.