Once again, I don't disagree with what you said for the most part except the 260F figure is not as concrete as you make it. For one, there just aren't that many bearing failures to support your claim. Two, a good full synthetic is good enough to support 260F without breaking down immediately. Will you be able to go 10K miles at 260F, of course not. Yet for a few hundred miles, I don't see any problems. I have hit 270F many times and I had my oil analysis done at 3000 miles, car had no abnormal materials in the oil.
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