Why would you need to block off a portion of the cooler (in cooler months) when the GTM has a thermostatic adapter. If you are running a straight adapter like most of the cheap ones you find, then yes you can over cool the oil, but a thermostat is designed to open and close based on temperature. It will just be closed more often in the winter than the summer. That being said, i would go w/ the larger unit.
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