Originally Posted by MaddMax
I don't believe for a second that the first piston was ever replaced. Subaru would most definitely have record of it. The fact that Subaru doesn't have record nor the previous owner means it was never replaced in my book.
It sucks you've had two blown pistons now. I think there's likely an issue with the block itself.
I just returned from dinner with a group of Subaru guys/girls that meet every Wednesday. I was telling my story and someone brought this same issue up and got me to think there is most likely way more to this story. I was asked one question that made me dig a bunch deeper. "Why did he sell the car to you so cheap?" I paid $22,000 for the car which was way under its value.
Simple answer: He had just traded a 2008 impreza sport for a new 2012 STi sedan limited and was going through a divorce. So he just had too many cars. The funny thing is that he had all of them at the same time and all of them were serviced at the same dealership. I am going to dig into this a bit further. Is it possible that one of the other cars is listed in Subaru's database as having piston 4 replaced. I think I might be on to something here. Either way it doesn't matter but I have to know.
As far as the block being damaged, the dealership told me to DRIVE the car to them to be diagnosed. If there is not extensive block damage now, there will be after I boost it the 35 mile trip.