It's called "warmup" and the computer does it. The mixture is set richer and idle speed increased to get the oil and internal parts up to temperature quickly. Cold engines don't idle very smoothly. In the old days of carburetion, either a manual or automatic "choke" was used to do the very same thing.
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2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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