There are several things to consider to determine if a cartridge is in good condition. Check the physical condition of the components, inspecting for signs of damage such as cracks, dents, or signs of wear. Make sure the rebuilt cartridge has been adequately balanced before installation. You should also check the oil flow within the cartridge. Check the oil lines and passages for any blockage or damage. If oil is not flowing correctly, it can cause damage to the turbocharger and the vehicle's engine. Rebuilt diesel engine parts sold at Goldfarb & Associates have been carefully tested and inspected. If you have any questions about the rebuild process and maintenance history, be sure to ask.