I'm just an ignorant consumer with 68 years under my belt. I ask you.... if octane does not prevent pre-ignition why does Valvoline say this?...
-----------
LOW-SPEED PRE-IGNITION PREVENTION
While the causes of low-speed pre-ignition are not fully understood, there are a few critical steps one should take to prevent it from happening. That includes selecting high-quality engine oil, high-octane fuel, and cleaning products for a petrol system.
-------------
Poor lubricant selection leads to a wide range of engine performance issues. One of them is low-speed pre-ignition (LSPI). Also termed stochastic pre-ignition (SPI)...
www.valvolineglobal.com