Agreed, my recommendation was to avoid running the pump with cold fluid repeatably.
I err on the side of caution and change Diff/Tranny fluid every 12-15 hours of track time.
I agree with your recommendation, and now that I've changed it twice and it's taken exactly the same amount both times, I'll probably skip running the pump from this point forward.
When you change your diff fluid, do you put the XL3 in as well? My understanding is that Torsens don't actually need it, so why bother, other than that's what Ford puts in it? Sometimes I wonder if Ford puts things like that in because they want to keep life simple for the guy running the lube rack, and not because the gears actually need it.
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