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At the risk of sounding redundant, yes times have changed. Modern engines do not need a warm up period much like they really don't need a break in period from new anymore. Letting your car idle to warm up now is only a selfish thing we do when we don't want to be in a cold car.
Moral of the story, directly from porsche, start it when you are ready to drive away. However as others have alluded to, don't give her hell until the oil is at operating temp.
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