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Originally Posted by JFP in PA
Actually, you are wrong about lowering oil temps; it is one of the most critical things you can do to extend engine life. And in this case, more than likely the designers were overruled by the accountants in the OEM configuration; both the coolant and oil run very hot the way the cars are delivered………….
It doesn't, but feel free to believe whatever you wish..................
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Actually, I've read a study that found low temperature operation can form acids in motor oils, and high temperatures can cause oxidation. There is an optimal temperature where both effects are minimized at about 90C, or 194F. So there seems to be a "too low" range and a "too high" range for optimum oil longevity. I don't believe I'm wrong at all, but I'd be happy to be educated on the subject.
I'd also like to understand from you how an engine that runs the coolant in the 200F range under steady state would notice the difference between a thermostat that opens at 160 vs one that opens at 180F.