Volvo D13 Mack MP8 Thermostat – Mahle Original OE – Replaces 21613426 & 21412639Maintain your engines optimal operating temperature and maximize fuel efficiency with the Volvo D13 Mack MP8 Thermostat by Mahle. As a genuine Mahle Original OE component, this thermostat is the exact part used by manufacturers to ensure precise thermal management. Engineered for the high demand cooling systems of Volvo D11, D13 and Mack MP7, MP8 engines, it prevents overheating and ensures rapid engine warm up, protecting your aftertreatment system