Mike,
You sound like a good, honest guy, and I have no doubts that you know your stuff well. I also have no reason to believe that your tune puts an S65 in any particular jeopardy.
However, that is really not the point, and it's not about what a dealer decides. Engine problems occur on untouched, stock engines, and that is what a warranty is for. The point is what happens when an engine problem occurs, and the engine has been tuned. And, it's the manufacturer, not the dealer, who can detect whatever they want to detect.
My view is that it is a risk everyone must understand. That's only fair. It's not fair to convey the impression that there is no risk. The odds are very great that you will not have an engine problem. But, if you do, you need to be prepared for the consequences.
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