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Just to address the temperature issue... When it's very cold out, condensation accumulates in the catch can, and if it's not emptied often, it will fill the can and get sucked into your intake. This is why GM says both not to use it when it's cold, and not to use it for daily driving. I know this because I found out the hard way with my previous car. If you empty it often, or live in Florida, I don't see why it would be a problem to leave it on.
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