Block heaters are mainly for diesel engines in cold climates. You don't need a block heater for your Z. If you live somewhere that cold, you shouldn't have the Z anyway. My Z has been through two Chicago winters, starts promptly in the cold, and is off the min temp peg in about ten minutes if I have the oil cooler covered. Don't waste your time with a heater.
You shouldn't idle your car warm. You should drive it immediately at low rpm to warm her up more quickly.
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2013 Cadillac V-Wagon, RIP Z
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