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86zn6: 100C requirement is myth. That's boiling temp of water, but water evaporates (and proportionally to temps rises rate of evaporating) way sooner then that, so that's not so much to care for. Though there is other reason why engine worth getting to working temps - relatively tight tolerances for modern engines for cylinders/pistons, thermal expansion, good compression/less blowby at right temps (matters more for turbo engines, especially if forged pistons) .. but as it's also not too wise every time to waste fuel heating up engine for 5-10min, for modern cars/engines one should just drive away right after starting engine, simply not flooring/pushing it until it's at right temps (also extra load vs idle engine running will also heat it up much sooner). One might argue that at cold start also oil might not yet oiled up everything properly (both engine & tranny), but it happens very quickly, way quicker then engine reaches "normal" temps, so less to care, especially if light driving/"not pushing" due cold temps yet will cover that too.
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