In backstop applications where the Cam Clutch is used with continuous inner race and mid-speed overrunning, the MGUS Series Cam Clutch can be fitted with an oil reservoir creating the MGUS-R Series. The added capacity of the oil reservoir plus the integral cooling fins increases the time between service intervals, permitting the free flow of oil between the reservoir and the clutch. A clear sight gauge built into the reservoir allows real-time checking of the fluid level and the general condition of the lubrication oil.