●?? OEM Part Number: 23013323, 23871486. ●?? Application Vehicle: Replacement for Volvo D13 MACK. ●?? Oil control valve is a vital part of every engine that is fitted with Variable Valve Technology. Responsible for controlling oil flow in the camshaft, it also helps in sustaining the functioning of engines internal moving parts. ●?? Warranty: We provide a 2 years warranty. If you are not sure if our products are compatible with your model, please contact us. ●?? Please carefully check the OEM part numbers and pictures to make sure it is compatible with your car. We are always here to solve any problems you may encounter, please contact us and we will respond as soon as possible.