tkenben t1_iurg6qv wrote on November 2, 2022 at 2:13 PM

Reply to comment by gathermewool 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

I've read a few books on taking care of older cars, though I imagine the same holds for modern vehicles. They all say, all things being equal, it is better to put the engine under light load than to run it stand still to warm up.