Getting into the technical side of things, a cold start not only lets your engine get up to temperature, but will also let the oil within get warmed up. Oil is a critical fluid in your motor as it keeps all the moving parts well lubricated and functioning optimally. If an engine hasn’t been used for a long while, let’s say from when you park your car at night to when you start it in the morning, most of the oil settles at the bottom of your engine. While there will still be residual oil at the top of the engine, it isn’t enough protection especially if you run your engine hard from its start-up. This is why it is important to give your engine a few seconds to get that oil pumping and up to temperature.
Getting your oil up to temperature will depend on its viscosity or its ability to be easily poured at a certain temperature. Its viscosity might be thicker at colder temperatures reducing its ability to flow and limiting its capabilities in creating a thin layer of protection for the moving parts. If you let your engine warm-up via its cold start function, this will allow time for your oil to get up to temperature and flow better.
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