I was wondering about how long I should let my vehicles warm up with a 0w-xx before I actually take off and drive. I ask this because if the 0w is supposed to flow a little better in the cold temps compared to a 5w it's obviously thinner at startup. So the oil gets around inside the motor quicker but because it's thinner isn't it providing less protection? Seems like you'd want the oil temp to increase some to get the viscosity up before hit the gas and get the rpm's up. Even in the summer time (with 5w-xx) I usually let my vehicle run about a minute and a half to two minutes before driving (if it's been sitting). In winter I wait about 3-4 minutes on average. My wife on the other hand likes to turn the key and put her car in reverse all in one motion. I think I've finally got her broken of that bad habit though. Anyhow, just wondering about this.