puzzledA4owner

Hoping someone can help me with an engine problem I'm having. I won a 2007 A4 cab. which started using an unusual amount of oil at about 89,000 miles. When I asked my Audi dealer about it, no good answer was found. The car has followed ALL audi maintenance and all maintenance has been done at the dealership.
With more research they now tell me the engine needs to be replaced (at $12,000.00). Still not good answer on why since everything was done as recommended by an authorized dealer.
Has anyone else had this type problem and do you all think it is reasonable that the engine needs to be replace with less than 100,000 miles?

thanks

puzzledA4owner

Sorry that should have said OWN an A4 cab. If I had won one, i probably wouldn't complain.