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A good portion of the mechanical wear and tear on an engine comes from starting/stopping it.

cold starting, actually.

Oil is viscous. It takes time for it to flow down.

I thought cold starting was only an issue in the distant past, and not for modern models.

Time to full lubrication and working temperature has been reduced greatly, but it's still there.

As I understand it, when your car comes off its fast idle (which even at -30 is less than a minute) you're good to gently go now.

probably only when cold.