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A serious drawback of the older Volvo system (Viscous Coupling) is, that you will probably have to buy four new tires if only one is bad.
Please note, that newer Volvos with Haldex couplings do not suffer damage when the tire sizes are slightly unequal.[/QUOTE]
Panic not - the viscous coupling disappeared in 2003 - so hopefully anyone on here is likely to be buying one nowadays (please)...
It did it's job in normal use and only failed when doing silly things on wet grass or up steep hills in the snow.
The main advantage to folks nowadays is that Haldex distributes the obscene amount of power 'we' get nowadays to all 4 wheels with no penalty - apart from the initial cost...
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