I wouldn't go 10K on any oil if you're driving the car hard. I stick to 3K w/ Motul, but that's at least partly because I know I'm not getting a full drain, lots of oil gets left in the cooler/lines on each change.
If I were getting a complete drain every time, I might go 6-7K, but even then I'd probably change early anytime I knew the miles were harder (lots of hard drives in the heat), or if the oil on the dipstick started looking or feeling bad (as the oil ages even if it doesn't change color much, you can "feel" between your fingers the difference between a fresh slippery oil and a worn out one, feels more watery/gritty).
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