I purchased a used 2002 Pontiac Grand Am last Dece...

I purchased a used 2002 Pontiac Grand Am last December with 81,000 miles on it. It was a one owner and the dealership told me that it had just had a through mechanical once over. I researched and checked everything pertinent that I could find on this vehicle, and it seemed to be a good deal. The dealership would not budge on the price so I paid them top dollar for this vehicle thinking that it would be a good vehicle for my granddaughter when she started to drive.
Had the car 6 months and low and behold I was driving down the road and it quit. The timing chain had jumped and the engine was damaged to the tune of $3,500!
So what I have now found out is that this is a common problem with this Pontiac Grand Am. Greeley Subaru is owned by Weld County Garage who was a Pontiac dealer so they should have known this.
The dealership said there was no way they could have known or prevented this happening, however I have been told that the KIA dealership told someone that a 60,000 mile checkup should include changing the timing chain as this is not an uncommon occurrence.
I understand the concept of "as is" however I believe there is a responsibility in selling used cars to know what could be a future problem and prevent it.
I had hoped that they would at least offer me their best deal on a replacement vehicle and was prepared to buy a new vehicle. When the salesman presented me with their best offer on a Mazda CX-5 he started at MSRP $4,000 higher than what I had found to be a fair price online.
At the Honda dealership their best offer was invoice. I purchased a Honda CRV for $5,000 less than what I was offered at Greeley Subaru.
Although I may not have a recourse due to the "as is" clause I will take every opportunity I can to let everyone I know of this dealership's refusal to stand behind a sale.