Ok, I can conclude from this that Castrol takes the prize in publishing the most confusing/deceptive specifications on their product. I can't believe how silly it is for an oil manufacturer to publish the specifications for compliance instead of the actual test results for their oil. And, even with that they have still been caught lying. You can't say in one line that it meets a spec that requires 3.5 HTHS and then further down they say it has a minimum of 2.9 (GF-4 spec). 'fess up and say what it really is!