LostCause pretty much summed it up. The engineers were aware its a manual transmission. If it is vented then you wouldn't have the pressure issue, but you would still have the heat issue. If you can live with the noise you will see gains by using less.
To counter the short trip problem I'd highly suggest an engine block heater. I would even use it in the summer. That'll help shorten your warm up time. With it in place I see no reason you wouldn't want to EOC. Personally, I would EOC even without the heater. What do you think your going to hurt?
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