How often do you set valves on a duramax?

On a Duramax diesel engine, valve adjustments are typically not required unless there is a specific issue, as they are designed to maintain their clearance over time. However, it is recommended to check the valve clearance every 100,000 miles as part of regular maintenance. If any unusual noise or performance issues arise, it may be necessary to inspect and adjust the valves sooner. Always refer to the manufacturer's service manual for specific guidelines.