Originally Posted by djdalaney
Yes, I have pretty good understanding of how almost every internal engine component works. Cold oil is thicker, but I still don't see the problem here. Cold oil + load would still wear more than cold oil + no load... This "wear" you guys are talking about is probably negligible. What internals are you worried about wearing out by idling after a cold start? Piston rings? Cylinder walls? Bearings? All of them are going to wear more when there is higher cylinder pressure. Low cylinder pressure = minimal wear. End of story.
I think he is saying cold engines will cause more wear. If you drive the car sooner it will warm the car up much sooner which overall has less wear than idling a cold engine for 10 min. There is no point to idling an engine that long unless you want the cabin to be warm before you get in it