All major manufactures are moving to 10k oil changes. Maybe these companies need to come talk to you since you obviously know a lot more than all their engineers do.
Exactly! What possible incentive do manufacturers have to lengthen the time between oil changes???? Do they want their engines to explode at 100k miles so that everyone needs to buy a new car?
Of course not! They err on the side of safety. And that usually means change the oil every 7500-10000 miles. Could probably easily go to 15k miles with full synthetic.