Yes, all open. Lift one wheel in the air and you are not going anywhere it will just spin that 1 wheel at 4x the speed. On the old quattros if you had good grip for at least one rear wheel or both front wheels it would still pull when diffs locked.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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