"If you check the owner’s manual, you will find that excessive heat and excessive cold are BOTH considered ‘extreme’ operating conditions, and appropriate maintenance schedule changes apply.
Follow the manual."
Talk about answering a question that was never asked…
I concur that cold weather is worse. Just look at how much longer cars last in the south. Much of the difference can be attributed to salt being used on the roads, but some things that don’t rust, like belts and hoses, don’t tolerate the cold very well either.