Spanwise oscillating surface elements have been widely studied as a means of drag reducing turbulent flow control; however, much is still unknown about the underlying mechanism resulting in drag reduction. Experimental studies in an azimuthally oscillating turbulent pipe flow were conducted across a wide range of oscillation frequencies, amplitudes, and Reynolds numbers. In comparison to previous work, the parameter space has been considerably expanded to provide deeper insight into the relationship between various key parameters and drag reduction. Drag reduction measurements are presented with corresponding key parameters: the non-dimensional period of oscillation, the non-dimensional velocity amplitude of oscillation, the friction Reynolds number, and a new parameter, non-dimensional acceleration of oscillation.