It won't compare to Mobil 1? I don't know about that. Maybe if you live in Northern Alaska or the middle of the desert. It's another one of those hot and cold issues.
I cannot speak for AMOCO, but I can speak for Pennzoil. I would stack our product up with the Chevron anyday of the week. Our's is not Group III, it is Group II+ base stock with a very robust additive package. Pennzoil ATF was the first ATF to stop the GM shudder problem. GM is using our ATF as a comparision to delvelope their next generation of ATF'S. I have Ford, GM, Chrysler, Mercedes Benz, BMW, VW, Nissan, Toyota, Audi, SAAB, Volvo, Honda, Mazda, and other dealers using our approved ATF'S for years without any trouble. I also have several transit systems using it in their Allison transmissions in their busses. It also meets TO-4 specs and works well in these applications.
So is the Pennzoil ATF better than Chevron ATF, don't know. But I do know it is as good as the Chevron. If your using the Chevron ATF, stick with it, I will stick with mine. (Unless Chevron buys Shell, Pennzoil-Quaker State)