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Been using it for the last 10K miles in my engine and tranny, no problems.
Of note, I started using it right after a fresh engine install. When we did a leak-down test before the supercharger installation (at the 10K mile point), the numbers were great, and there was less than a 2% difference between cylinders.
Another C5 with 50K FAILED the necessary leakdown criteria, and had been running M1.
I know that's not overly scientific, but I like the oil.