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The current manufacturer's recommendations typically are to drive the car rather than leaving it to idle to warm up. However, this does not mean that one should dirve it hard until it is warm. I never rev beyong 4000 rpm until it has come up to operating temperature; indeed, if outside ambient temperature is below 60 degrees F, I short-shift at about 3000 rpms until warm.
Remember, it is not just the engine that is cold, but also the transmission. Since they often take even longer to warm up in cold temperatures, I shift slowly until well after the water temperature gauge has hit center. I also double clutch my downshifts, althouigh I also do this even when the car is warm.
Brad
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