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Originally Posted by Jake Raby
The Boxster does not have a dedicated oil temp sensor. The oil temp a calculated value based on the coolant temp. It is no where near accurate in my experience.
High temperature oil is more susceptible to G force issues than oil that is cooler, it also loses it's ability to maintain film strength at these elevated temperatures.
Oil temp in these engines does NOT closely follow coolant temp, especially in 5 chain engines where the friction is highest. Here are a few comparatives from one of our test cars on the street and on various tracks. The delta is much greater on the track, especially in high ambient temperatures.
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That's great info Jake, I did not see this post before I did mine. Looks like oil temp runs about 36 degrees higher than coolant. I'm guessing this test car had 3rd radiator, S heat exchanger & low temp termostat as the only cooling improvements?