I've been trying to tell my LS1 friends not to run straight 15w50 Mobil 1 in their engines, due to the fact that the thicker oil doesn't transfer heat as well and doesn't flow as good. Someone then responded with this:
I don't know about the rest, but this excerpt is absolutely wrong. This would mirror the thermodynamics of the engine cooling system. If the coolant flows too quickly it doesn't absorb enough heat from the surfaces it is passing over and overheat the parts it is supposed to cool. It seems to me that if the oil runs slower over a part, physics would demand that it draws more heat from the surfaces. So while I agree that the oil flows slower, therefore making cold start wear worse than thinner oil... I disagree with your assertion that the oil wouldn't take away heat.