Why are cars harder to start when the weather is cold?

If you have car cold-starting problems, it is worth having the cause attended to.

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Why are cars sometimes harder to start when the weather is cold? Why does using the choke help? My car doesn’t seem to have one.  --Bernard.

Mechanical things are profoundly unamused by the cold. As a chill dawn breaks, the oils in your car lie in cold and gooey pools in the bottom of your engine, gearbox, and differential. Much greater force is required to turn the cogs, shafts, and bearings through this thick morass than when the oils are hot, runny, and evenly smeared over every moving surface.

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