Originally Posted by matt777

You shouldn't let the car warm up fully before taking off. That is the slowest way to warm up an engine from cold. You can check with Porsche on this. I'm sure there are other posts on this topic. Typically the recommendation when outside temps are very cold is to run it briefly until the windows are adequately defrosted and then drive it asap keeping the revs low until it warms up fully (less than 4000 rpm approx). The car will warm up faster this way and it means less wear and tear.