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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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This time of year, the engine heats up quickly, but in the winter, even after picking up my coffee at the drive through (I know, I know), the engine is only about 170F when I shut it off. Since the work commute is where most of the engine-hours are spent, it sees very little time at 195F, which is not very good for the engine or the oil.
I will drain out the transmission this weekend. As GM and Getrag have claimed, the growling is purely an annoyance and does not negatively impact the lifespan of the transmission. Mine looks like it could go 300K with no problems.