Catalyzes the oxidation of benzylsuccinyl-CoA to benzylidenesuccinyl-CoA. (R)-2-benzylsuccinyl-CoA + H(+) + oxidized [electron-transfer flavoprotein] = (E)-2-benzylidenesuccinyl-CoA + reduced [electron-transfer flavoprotein] Inhibited by (S)-benzylsuccinyl-CoA. Optimum pH is 8.0. Optimum temperature is 50 degrees Celsius. Xenobiotic degradation; toluene degradation. Homotetramer. Induced by toluene. Belongs to the acyl-CoA dehydrogenase family.