How does a viscous coupling work? (as on the 155 Q4)

To: alfa@domain.elided
Subject: How does a viscous coupling work? (as on the 155 Q4)
From: <maxid@domain.elided>
Date: Thu, 02 May 2002 11:41:04 -0400
Reply-to: <maxid@domain.elided>
Sender: owner-alfa@domain.elided

In descriptions of the viscous coupling (of the center differential), it says that when the fluid heats up, it offers more resistance. Isn't this counterintuitive? The lubricants I can otherwise think of (e.g. engine oil) get thinner as they heat up. Could someone explain?
THanks,
Sonny 91 164S
Baltimore
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