We had one of Driven's techs at our shop during a dyno session with John McGann of Car Craft, running a sb mopar. The tech told us the reason they like to see 180° is they claim that's when the additives "work" or "energize". Nothing was said about heating the oil prior to startup...and he was there for that. And once the oil reached 180°, they attach themselves to the metal parts of the engine helping reduce startup wear. Was interesting.
