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What Brighton said. If the thermostat is plumbed correctly and operating at it should, there is no oil actively flowing through the cooler and it's not cooling the oil. So covering the cooler shouldn't do anything.
But do the experiment as a troubleshooting step - cover the cooler and see if it makes any difference.
I saw in an earlier post that you've tested the thermostat, but the symptoms you're seeing seem to point to something wrong in your scavenge circuit.
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