"Evan" wrote
It has nothing to do with the engine oil change military
industrial complex wanting to stiff consumers out of
money for more frequent oil changes at all...

B S While you are correct for severe service, the oil change places just
put that 3000 mile sticker on the car as they have been for 50 years. Under
normal conditions, you can easily go 5000 to 7500 miles and not do any
damage. Oils and engines have changed since 1960. I remember it was common
to do rings and bearings on an engine at 50,000 miles. Those days are long
gone.