I'm using the Fuchs (we have it here) but I'm running MUCH thicker than anyone listed here (full race cars) My 5sp trans failures dropped dramatically with the thicker gear lube. I found the gear lube coolers to be a band-aid. All the cooler did was keep the standard issue gear lube from breaking down. So? Run a thicker gear oil. We are not trying to drive the race cars in 30deg. weather. I just pre-run the car prior to the first session and let the engine temp and rotating input shaft of the trans warm things up 
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