To add to the confusion, why would you want it to be really thin at startup? I know that you want it to flow a little better, but how much is too much? Almost all the diesel trucks that came to our shop for oilchange use 15w-40 oil, does that mean their engine are going to blowup? Also, if thinner oil is better, then why would they want the oil the thicken up as it reaches operating temperature? Synthetic oil doesn't get affected much by temperature to begin with, so what exactly are you benefiting from using Mobil 1 0W-30 instead of 5W-30 in winter? I mean it's synthetic oil, and they really don't get that much thicker when it's that cold out (heck, they're thinner than at operating temperature). I just don't understand all these confusion...
