I don't believe that the overall life expectancy is 150K miles. I do however believe that certain parts and components will only last that long such as starters, alternators, ball joints, etc.

 

End of life isn't just one number such as 150K miles. You have to couple it with a failure rate to make the number more meaningful. And it gets more complex than that if you want it to be. But I don't want it to be.

I don't know how Ford defines their life targets but I am accustomed to defining it as when 10% of the population has died off. That means 90% is still out there running around just fine. And it takes a whole lot more miles to kill off 50% of the population.

So when somebody says the life of the engine is 150K miles.... well, that's pretty much an incomplete thought. It could be outstanding if only 1% of the population is gone. Or it could suck didely uck if 75% of the population is gone. And let's be frank for a moment -- nobody doing any of the talking here knows the real number, and anybody that does know is going to stay quiet because it's not their job to talk about those numbers to you... or you.... or even you.

So the only thing left at our disposal is observation. And my observation is that 150K miles is child's play these days.

 

I won't tell you the actual design life, which I know, but 150,000 miles is not even close.

 

I installed headers, performance exhaust, performance injectors, larger throttle body, and a Mopar performance ECM (among other things) on my 1996 Grand Cherokee. A year or so later I was wishing I could take it back to stock.
I did install some sort of tuner (don't remember what kind) in an F150 but things started going awry, so I took it out.
My Jeep Grand Cherokee had 350,000 miles when my step-son totaled it.
My Pontiac Grand Prix had 330,000 miles when it suddenly dropped dead.
My Lincoln MKS currently has 125,000 miles.
At 80,000 miles, I pretty much regard my F250 as a spring chicken.

 

I would hope that figure would be at least double that.