I found this to be very informitive to view. I know its a ford but with the right oil even they can make it to a million miles. 5.4 ford van was dirven a million miles and then taken to Rankin Technical Collage to a total teardown of the motor. To say they were impress as to how well the oil performed would be a under statement. To View it go to Schaefferoil.com/million.html. enjoy