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Fuck_You_Alls t1_iurkir6 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

Ya try driving in -38F weather only letting your car warm up for 5 to 10 minutes. Its so cold my fluids never really thaw out.

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bufordt t1_iuryx6m wrote

I did it at least a few times a year when I lived in Fargo, ND. Just drive easy until the engine is warmer. The engine warms up faster when you're driving than it does idling in the driveway.

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colem5000 t1_iusk7rg wrote

And is hard on your engine. It’s not being lubricated properly. You’re doing damage to your motor.

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bufordt t1_iusmxqz wrote

A lot of what I've read says it's harder on your engine to idle when it's cold than to drive easy. In part because the lubrication gets spread around sooner.

Edit: And let's make sure we're talking about the same thing. I'm talking start your engine, and then start driving normally within 30-60 seconds, vs starting your engine and letting it idle for 10-20 minutes.

>most modern cars are able to successfully circulate oil within 20-30 seconds

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colem5000 t1_iuspshe wrote

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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dr_xenon t1_iurln3m wrote

-38F is an extreme situation. At 0F 5-10 min is enough.

At -38F I might not shut it off at all.

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