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One thing this "expert" is ignoring is that engine gaps and tolerances change with temp too. Some gaps don't tighten up until your engine is at operating temp so more oil oozes through them until things warm up. He also ignores the fact that most oil pumps are geared directly to the engine and will try to pump a fixed amount of oil. This means that dropping the viscosity may not increase the flow rate that he claims makes up for the drop in pressure.
He is also full of it when he says ambient conditions don't make a difference. My car has an oil cooler and a ribbed oil pan to dissipate heat better. Clearly these are affected by ambient temps.
If there was 5w-30 oil available when your car was made and your manual calls for 10w-30 the factory did it for a reason. Stick with what your manual says. This guy doesn't know or recognize all the implications of what he is suggesting.
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