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Nothing in the anti freeze. I drew a pretty good sample right off the top and found zip. In fact it tested out to -45 , which is just about what I put in it this past winter when I went and had the super cooler four core done up.
When you checked the oil, (and I'm not trying to be a smartass), it was on level ground?...and it was after the truck had sat for a short time after running?
It sure sounds like a lot of oil used in such a short distance without some sort of noticeable sign, like smoke or a big puddle.
Nothing in the antifreeze?
Did you answer this part of the question ?
At 1 QT in 185 miles , I'd be adding oil every other day.
Which oil did you use to break it in? First oil change?? Although it is odd it was good for so long then started in. Then again the consumption rate now. Even my diesel isn't that thirsty, and Wally world oil doesn't vaporize that fast.
The fact is , oil types can be kicked around like the choice of apples over oranges . Or more direct line would be, what do you prefer ? Apple pie or cherry? Oil types won't have that much of an impact. If they did then we'd all know something more about it.
I am looking at oil types from an engineering standpoint, the original designs, not a brand preference. When you deviate from design considerations, without making design changes is when you see troubles. It is science, not opinion. The weights of an oil make a huge amount of difference on their ability to protect and flow properly, which is why manufacturers specify certain weights and types. Thicker oils resist flow more, so they hang around longer. It takes more energy to make them flow, as well as different clearances to get the similar volume of flow. So no, it is not what flavor, it is what flow rate you need for proper protection. Flavor is a choice in brand. However, that is moot point for the question at hand.
Reason I kept asking about break in oil and such is that it was never clearly stated, merely implied. Break in oil is part of the break in procedure, as is the varying rpms that you were correct in doing. As I don't know you, I don't know what you do and don't know, so I have to ask questions for clarity on what you do know. Break in oil should be changed in the first 500 or so miles. You never stated if that was done. You had said you use Rotella 15-40, but never designated it as break in oil. I also stated I have had many old time engine builders tell me non-detergent oil for break in oil, then regular oil from there. That is experience talking, and is opinion based.
We are simply trying to help. I understand you are frustrated, and have been dealing with it first hand for so long, you likely also don't know what all has been said or not. I run into that when drafting drawings for new designs and don't realize I left out dimensions and details until someone that has never seen it before has to ask me about it. I will have been looking at it so much that it is ingrained in my head and doesn't make it to the paper.