It's a light 0w-20 to a heavy 0w-16 (KV100 = ~7.8 cSt). It actually does perform superior to PAO with less valvetrain and cylinder wear attributed to better additive response with the group III base oil. We're talking about the highest budget racing programs in the US if not the world. These guys spending hundreds of thousands researching ways to gain a 0.5 hp advantage. If there was an advantage to using a majority PAO base oil, they'd be using it.
Here's an article in Machinery Lubrication detailing how group III base oils are rivaling PAO in many areas and superior in some areas.
"A modern Group III oil can actually outperform a PAO in several areas important to lubricants, such as additive solubility, lubricity and antiwear performance. Group III base oils can now rival PAO stocks in pour point, viscosity index and
oxidation stability performance."
This is the third of a three-part series on base oil technologies and applications. Lubrication technology evolved slowly from ancient times until the 1950s. Solvent-refining technology then...
www.machinerylubrication.com