"Better" is a relative term, so I'll disagree with Pablo on some level.
"Better" is how you define it. You must rank order your wants/needs and then decide.
If you desire longevity of OCI then synthetics and high-end filtration are paramount. But if short OCIs are going to be routine, then high end products don't typically pay off. It's a question of "value" for some, and "protection" for others.
How long will you honestly keep your Dmax, and how many miles will you accumlate? The list of variables goes on and on.
Amsoil is likly "better" at some things like OCI longevity and thermal protection, but if you don't operate with these as limiting factors, then the added cost of PAOs does not really make sense.
If a top-end synthetic and filter cost 4x as much money, but you OCI at the same intervals as "conventional" oil/filters, would you get 4x less "wear" from the top end products? Likely not even close. So is it "better" to pay 4x the $$$ for perhaps (nearly) the same wear? Not for most of us.
For "normal" OCIs, today's dino fluids suffice more than well enough, for a much smaller cost. For extended OCIs and/or extreme (and I only mean E-X-T-R-E-M-E) conditions, then high end products make sense.
"Better", as is beauty, is in the eye of the beholder ... [/quote
Thank you for the great explanation! I really just asked about Castrol because I did a search and did not find anything about Castrol (Hypuron) And I am curious about this oil. I did not want to start a who's oil is better thread, I am sure this place has been through that before and there is to many mixed opinions. Thanks to everyone for their replys and thoughts! Btw the transmission sample came back positive considering it has a suncoast and transynd fluid in it..