Automotive/Technical Video 3 weeks ago VIDEO: What Is The Difference Between An OAP And An OAD? Share Tweet Print Email Andrew Markel,authorView bio Bio Recent Posts Popular Posts Nissan Titan Rear Axle ServiceHVAC Sensors: More Than Just TemperatureDealing With Brake RotorsAlignment Specs: Scion FR-S & Subaru BR-ZVIDEO: Can Synthetic Oil Cause An Old Engine To Leak? Diagnosing Wheel Bearings, Locking HubsAlignment Specs: Scion FR-S & Subaru BR-ZVIDEO: Are All OAD Pulleys The Same?Brake Pad Copper UpdateVIDEO: Using The Search Function To Find Service Information Andrew Markel discusses vibration control alternator pulleys, and the differences between the two most common designs available on the market. Sponsored by Litens. Video courtesy Underhood Service.