But to Jim's point, you do need for the
oil to get up to a certain temp before it's hot enough to "boil out" the contaminants and other by-products that build-up in the
oil itself (mostly as a result of internal combustion). And that is why he (and I) favor the Canton unit...it assures you of that without allowing the
oil to get too hot.
I would also further agree that getting oil to that 212 degree level in these cars is difficult (at best) on cooler days. At least with ANY thermostat we can all agree that recirculating 90+% of the oil back thru a warming engine is better than 0%.
-Dean