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I spoke with a long time family friend last weekend, he's owned a Transmission shop for over 40 years now and he swears by AMSoil. Like he said, sure you will pay more for the quality but they have done the R&D over the years to get the best.
He also went on to explain the 5 oil groups and pretty much anything off the shelf in NA will be a group 3 oil. There are a few exceptions like the Amsoil Sig series is a group 4 along with some redline oils.
I wasn't aware of the oil groups and have no knowledge other than what he mentioned. He even said some oils are just distributed from a large factory and many companies just slap their brand on it. He said Supertech is one of them. Not sure on the accuracy, just food for thought.
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