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colem5000 t1_iuspshe wrote

Reply to comment by bufordt 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

Not when it’s cold. Oil doesn’t pump properly when it’s thick. Even when your driving easy your RPM are still well above idle RPM. I don’t know where you’re reading that from but as a mechanic I can assure you that it’s wrong. With the oil technology further advancing it getting better but it’s still hard on engines.

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bufordt t1_iutq2im wrote

You'll have to forgive me if I believe the experts at the car manufacturers, Liqui Moly, Shell, and Esso over a random "mechanic" on Reddit.

From Consumer Reports:

>Modern cars have improved on technology to the point that your engine is fully lubricated within 20 to 30 seconds. By the time you get in, start the car, put on your seatbelt, and get situated, the engine might not be fully warm, but it’s completely lubricated and you’re okay to drive at this point.

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