First impressions, I recently replaced the factory thermostat on the 2000 VW Golf VR6 as a precaution that I bought. I'm not exactly sure what makes this thermostat "run" but I can say it's solidly built. It has the same opening temperature as the replacement factory thermostat. Although the price seems quite high compared to other thermostats you can buy, I wouldn't hesitate to buy another one if the need arises.