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Message: <blockquote data-quote="dutch" data-source="post: 553887" data-attributes="member: 11020">Go with 180. What paul is saying is:When you coldstart your car, it runs in what's called 'open loop mode', which means the computer uses a default setting for air/fuel/spark, that's why it smells like gas and pops a little more, because the computer is ignoring the sensors.When the car warms up after a few minutes, it starts calculating air/fuel/spark again with input from several sensors and the car runs in 'closed loop mode'.Now if you use a 160 degree thermostat, you risk the car running too cold tricking the computer into thinking the car is still cold, causing it to stay in 'open loop' and ignore sensor input.correct me if I'm wrong</blockquote>