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I can almost guarantee for the roller video they disabled the DSC system on the audi. If it was enabled it would have engaged the brakes on the spinning wheel allowing the open diff to transfer torque to the other wheel on the ground. It's a BMW video so wouldn't surprise me.
As for the "real life" test vid in the snow/ice above there are other factors that come into play as well. Tire type, tire pressure, gearing, and driver ability all are factors.
I used to see plenty of soccer mom's in their bmw/audi SUVs slide down hills bc they just flat out didn't know how to drive in the snow. Meanwhile I'd be passing them up hill in an 88 sentra starting in 2nd gear with shitty goodyear snow tires.
I wouldn't base a car purchase on one marketing awd hype over the other. If you suck at driving no awd system will save you.
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