Hey WSTAR... I read about your spacer, nice job. There are plenty of engineers and chemists better qualified to answer your question but my quick input is that yes, especially with thicker oils it is better to have a thermostat and avoid running hard at low temps... and there is probably a reason that most thermostats open at 180f... other than that, not sure exactly what the right number is for our cars and your particular oil... Given that I'm using a lot of cooling and a thicker oil, I'm planning to use a thermostatic switch. Re how they work, my understanding is that they are binary - either open or closed - at a given temp... some may open or close partially
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