Originally Posted by bill_de
I know that as long as there are at least 2 types of oil, one or the other will always be best in the minds of many.
That got me wondering, no matter what oil is used, are there many engine failures these days in vehicles that are used under normal use? It seems that years ago it wasn't unusual for people with high mileage cars to get a valve job, often because of a problem with the guides. Maybe less common, but not unusual, were ring jobs and cam or crank bearings. I don't hear about much of that anymore, and cars seem to be lasting longer than ever.
Is deciding which oil to use, within manufacturer specs, much ado about nothing?
Much more ado [and dis-information] than you can shake a spear at.
Its been decades since there were even oil incompatibilities, where the military buyers sort of allowed as how they'd better play nice together or lose all sorts of military contracts.
Personally, I tend to prefer a full synth, but I wouldn't even care to try to begin to justify that on technical grounds or any actual wider viscosity/heat/load range compared to a good premium dino pee type oil that meets MDS requirements.
Converting to full synth mainly cause the service manager made me a deal on the Pennz platinum compared to the standard Pennz they use in the Hemi. [Suspect they may be trying to get rid of the traditional one for very little additional bulk cost, but I'll take it.]