[Formulajones]

Originally Posted by MatthewKlein

The engines that fail for lack of oil almost always result from burning the oil. Not from leaking externally. The engines that fail from burning oil ALWAYS burn oil from extended oil change intervals. Sometimes these intervals are Factory Recommended.

For what my 2cents is worth, I will never recommend extending an oil change interval. 2cents isn't worth what it used to be.

Hopefully I can be an asset to the forum

This is something I agree with with some caveats.

We don't know what kind of oil or filters these owners have used over the life of the vehicle. They may have been the cheapest crap they could find (which is typical) and not something that would be formulated for extended change intervals. Some of the filters on the market are really horrible too. Owners don't much care if it's a lease or something they'll trade in after 5 years. Lots of grey area there. If you work in a shop you've probably seen all kinds.

I'd never recommend extending any oil change either, without an oil analysis first.