<p class="font-claude-response-body break-words whitespace-normal leading-[1.7]">A failed2009 GMC Acadia engine doesn't have to mean an expensive dealer repair bill. The 3.6L LLT V6 is prone to timing chain stretch, oil consumption, and head gasket failures on neglected examples &mdash; but a quality used replacement solves all of these problems affordably. Ensure your replacement matches your drivetrain layout, as FWD and AWD variants use different configurations. During installation, replace timing chain components, thermostat, and water pump as standard preventive practice. Request mileage-verified documentation and a compression test from your supplier. Hundreds of Acadia owners have successfully restored their vehicles with quality used engines, returning them to full reliability without the financial burden of a brand-new factory unit.