Why is the viscous-coupling not used in modern 4-wheel drive vehicles anymore?

So what is the best all-wheel drive system then? Haldex? Torsen differential? xDrive?


Test rig & T3-Visco

What's the effect of the Carbon dioxide in the Viscous Coupling?

Why does viscous-coupling hardening appear so often in the T3-Syncro?
Isn’t the "oilsucking" a result of an overheating viscous-coupling?
Doesn’t the special valve in the Visco lid cause a dynamic unbalance?
But the test stand is upside down; doesn’t that inevitably lead to different measured values?
At VW-Kern, do you test each viscous-coupling in gear oil?

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