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Maximum_Poet_8661 t1_iur6rvp wrote

Reply to comment by dr_xenon in 30 minutes of car preheating in sub-zero conditions produces as much particulate emissions as driving 97km in a gasoline car, or 20km in a diesel car “These findings do not suggest to stop preheating cars; instead, we could reduce the emissions by using similar methods that are in place for engine” by giuliomagnifico

it depends on how cold and wet it is tbh, if it's freezing outside and there's ice all over every window I'll probably let it warm for 10-15 minutes minimum so it's easier to scrape off all the ice. If there's no ice on the car I don't care though, I'll just let it warm for 3-5 min if it's extremely cold or just get up and go if it's only moderately cold

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gathermewool t1_iurc12e wrote

Good point. The only time I idle to warm up is while clearing ice and snow off the car. The heater may not put out a ton of heat, but the rear defroster (and front in my vehicles) will get the melting started while I work on the rest of the vehicle.

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