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My OEM heat exchanger works well at bringing up my oil temps from cold.
Typically my oil is at temp at least twice as fast.
This is why I installed it.
As for cooling, it has a really small effect really, and once heat soaked has a negligible effect.
These things are not new, plant and heavy industries have been using simular exchangers for years, to bring up and stabilize fluid temps, they work as designed (which isn't always the same as the aftermarket car parts marketing/advertising).
Great mod for a street car, both NA and boosted because you don't need to wait as long for your temps to stabilize, thus you can lean on it sooner, why do you think the WRX STI and other makes running turbos has them as standard, hell, old RB26's had them to bring up their oil temps from cold.
If you want to look into their heating/cooling effects there is information on the Googles IRT thermodynamics which explains it way better than the monkey typing this post.
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