It has nothing to do with me PROVING anything.
I was just using your words.
Point is, I'm completely comfortable with you choosing your oil and change schedule based on what you think is right for your situation. But if you want to present this as the BEST solution for everyone and not just your opinion, then yes, proof is needed.
Since you have done the oil analysis on one powerstroke diesel, then any inferences you could draw from that are very limited. For any such comparison to have merit beyond your personal experience, you would need a large number of new trucks on which to run this test. Then you would need to have two treatments, one with X brand oil, and one with Y brand oil. Then they would need to be run under identical loads and the oil analyzed thereafter. These data would then need to be statistically analyzed to determine if the differences were meaningful.
I could go on, but I know you get my drift. We all make decisions based on data that is at best incomplete and in all likelyhood biased. But it's the best we've got and so we go with it. And who are you going to trust more than yourself.
I had a car I only used synthetic in until the day I sold it. At 50 k the head gasket failed and I had to pony up $800 /forums/images/graemlins/mad.gif I didn't blame the oil, but you've got to wonder. Also, there were a lot of other things going wrong with the car that made me think that perhaps the engine wearing out was the least of my worries.
Currently, I've got Mobil 1 in my expensive 4-stroke outboard because I think the oil is a superior product and 6000 rpm is hard on any oil. But in my trucks and tractors I've got conventional oil that gets changed at 3k. No problems yet.
Just my personal experience and choice.