In this study, we examine how mentoring benefits mentors as well as how team cohesiveness affects mentoring relationships and resulting benefits. We followed 512 formal mentors in a Chinese manufacturing firm for six months and collected data in three phases and from three sources. The findings reveal that the amount of mentoring provided is positively related to mentors' in-role job performance and social status. These relationships were fully mediated by mentors' personal learning and social interaction quality, respectively. Team cohesiveness, however, did not moderate these relationships. Our empirical findings have implications for understanding how mentors' careers can benefit from being a mentor.