We understand the frustrations that engine concerns bring, @2022 Elevation If you are currently experiencing symptoms of lifter concerns with your Sierra, we would like to learn more. Have you brought your concerns to the attention of your local GMC dealer? If not, we highly encourage you to do so. That said, would be more than happy to provide an extra layer of support in the process. To begin, please visit: https://s.gmc.com/support-request and fill out the pertinent details in the support request form. This will ensure that your request is routed properly so we may explore the best path of assistance moving forward. We will be sure to keep an eye out for your outreach.