Originally Posted by POPEYE
so what you are saying is that castrol is shit basically
No, it doesn't say that. The point is that there are better quality oils out there that are tougher and better for extreme applications. By this I mean modded cars and track days etc.
The Castrol is labelled a synthetic but in fact it is not a proper one (pao/ester based), unlike the others mentioned here which is evidenced by the shear stability which meets the minimums required by API and ACEA.
In conclusion there are better oils out there.
Cheers
Simon