"Iain Miller" wrote
>
> I thought the 10/100 warranty only applied to the original owner & that as
> soon as the car changed hands it expires......(?)

Well, the way it works in the US (if that's where the OP is), the original
warranty is 4 years/50K miles, and is fully transferrable to the new owner.
However, if the used car is sold as an "Audi Assured" certified vehicle by
the dealer, it comes with a 10 year/100K mile warranty to the new owner.
That's just an incentive for people scared of high repair costs to get them
to buy a used Audi. Now, a certified Audi is more expensive, and we don't
know if the OP bought one like that or not. If he bought it directly from
that girl, then it's definitely not a certified vehicle and his warranty is
long gone.

Regards,

Pete