I've seen that statement made a couple of times, but where is the evidence it is designed to do so? And mechanical shear? That means an inferior VM, does ExxonMobil really make this oil with a VM that is prone to mechanical shear?
The other issue I have is that most of the UOA on here are from Blackstone and they are incapable of distinguishing between mechanical shear of the VM and fuel dilution. Fuel dilution is much, much more common on most engines. Is there really a base of properly performed UOA that demonstrate this mechanical shear of AFE VII?