m6pwr, you are overstating your "data." At best, we have a large range of mileage at which one can reasonably change the oil.
There is no "correct" answer and no one is going to be "right."
If all engineers and manufacturers agreed as to the specific mileage to change an oil fill we would all know by now.
We can all agree that if the oil is older than a year, change it. Let's leave it at that.