I've thought of running Evans in street cars before, and have used it on race bikes over the years with good results. Problem seems to be that it has less specific heat capacity than water does, though it does boil at a far higher point. Either way, it would be a decent size project to get ALL the water out of the system prior to filling with Evans. It's a pain on a bike so I imagine it'd be a big pain on a car (esp a mid engine car with rads up front).
As to the oil cooler, I think the solution is not to direct more air to the laminar cooler, but rather get rid of the cooler and just run the oil to a "normal" air/oil unit so that the coolant now only has to cool the engine, with the oil being cooled by its own cooler.
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Boxster S
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