The engine hasn't been replaced because it hasn't failed. I talked to my buddy's dad who works in the dealership and he said they haven't really had any that have come through with this failure.
I was trying to see if all the engines were made at the same plant, or if the ones that failed were made at a different plant - but have been unable to find this information via the internet. I also know of a few people who have them, and they haven't had any problems (so far).
Again, i'm hesitant, but it's a good buy - and i'm just trying to be real educated about it.
I do appreciate your comment - and i'm full aware of this issue - i'm just trying to gain a certain level of "probability" with this possible purchase.