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I think the AWD system in the 159Q4 is based on the 164 Q4 system, it is a permanent 4wd with rear bias 55% rear 45% front that can go up to all rear or 70 % front if needed, it feels nearly as nimble as a rear wheel drive car but much more stable, great for snow and mud, it uses 4 individual diffs.I had a Suburu Liberty AWD before it but I think the Q4 system is more advanced. Hopefully Alfa continue the Q4 so you will have the opportunity of buying it in the US when Alfa eventually come back. In the mean time if you could get a 164Q4 it would be a real collectors item for the future because it would be the "ultimate" Alfa sedan and a great drivers car to boot with that magnificent Arese engine powering it that is sadly no longer available.
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