Welcome to the results of a study by the University of North Dakota.Since IC engines create hydrocarbons + hydro-everythingandbeingHydrogen= Acids, I worry more about amount of 'time' acidic oil spends in the engine.
Thus, I change my oil every 90 days to minimize corrosion. Being a poor fellow, I cannot afford synthetics or synthetic blends every 90 days + filters.
I ignore mileage & just change oil quarterly.
A litmus testis interesting and easyon changed oil.
It would seem that an alkaline additive [ie, lye, liquid lime] could be used for neutralizing acids to a safe pH and extend the life of the oil.
Lube, vehicle makers, techs, etc.,would not be happy to see the loss of revenue. If someone named it a "Green" product, they'd probably get rich [if they could explainHS chemistry to the generalpublic].