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I have thought about that too. My idea was slightly different though. Have a normal external oil cooler outside and one mounted inside under the rear seat, with a fan blowing air from under the seat to inside the car. Use an electronic change over valve with the switch mounted in the dash to change coolers. Or have a 3 way switch to use both coolers if needed. Use two thermostats, one for each cooler, with the inside cooler having priority if both coolers are running, so the outside cooler works as secondary.
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