I trust scientific tests done over 4 years and on over 100 vehicles of all types, more than anyone's opinion.
The test involved over 1/2 a million miles engines in trucks as well as taxis, new stuff old stuff changed oils unchanged oils etc.
Basically results were piss poor for castrol that lost it's viscosity as soon as it got hot, and did NOT regain it, same with moby 1.
I have used both, and would never use either again, but castrol, rs was a complete joke with oil pressure when under pressure.
tabetha