The point being, if auto engines were so designed (like commercial application engines), instead of possibly 250,000 miles, consumers would be seeing 1,000,000 miles out of their automobile engines!
That just doesn't fit with any product we buy and business models, keep 5 years, junk out, buy new.
Don't ya know, it's the American way, LOL.
I doubt the economics are there...the median car on the road today is 11.5 yrs old...implied mileage near 140,000....half are greater. By 20 yrs old so many high cost systems are failing and corrosion effects in the northern part of the country would over-ride the value of a super premium engine.