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I can add anecdotal information about viscosity and cold weather. When I start my Subie in the winter and let the clutch out (in neutral), the load it places on the engine is palpable; the revs drop, the computer compensates. The car even moves a bit, so I make sure the handbrake is set before letting the clutch out. For the sake of comparison on that engine (2.5L turbo flat four), when the AC comes on there is no discernable difference in load whatsoever; I just hear the clutch lock in.
That's just the oil in the transmission. No diffs are turning, no wheel bearings either.
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