[S2GART]

This is not a question about what oil to not use or use, but does anyone have proof that a particular oil killed or shortened the life of their engine? As anyone reading this knows, everybody has an opinion of what brand/weight and type oil to use and not use, but does anyone have proof that if you don't use say Mobil 1, that your engine won't last as long?

Unless someone stuck with the same oil weight/brand for over a very long period of time, to only then suffer a failure proven to be related to the oil, then all this talk about using Brad Penn/Mobil 1/Valvoline/ etc. is just that......talk.

A lot of people say to use full synthetic because you can extend your oil changes, off setting the cost. Yet the owner's manual for my SC flat out says that the oil change intervals are the same regardless of the type of oil one uses. Others say that one's engine will last longer using synthetic. Since synthetic oil cost literally twice what dino oil cost, so does that mean your engine will literally go twice as long before needing a rebuild....? I am guessing no.

For those who believe the gospel of Porsche about using Mobil1.....that is pure marketing.

Thoughts anyone?