Hi, First time posting here. I've seen several posts about broken pistons and have the same problem which I'm ticked off about so I thought I'd share what happened. I bought my Malibu in April 2016. Just before hitting 60k the stabilitrack light came on with a decrease in power a few times. I didn't think much of it because it it went off each time and the engine went back to full power. Then at just over 62k I got a check engine light with a decrease in power. Power returned but light stayed on so I took it to a shop that read the code. It came back with p300 or so code which the shop said could mean a number of things. They cleared the code and I drove it waiting to see if it would return. It drove find for about a month and then started running rough with a large decrease in gas mileage and decided to take it to the dealer. The day before dropped it off the check engine light came back on. Anyway, the dealer checked it out and said I have a cracked piston and they have to replace all four and that it would cost 4-5k. Since it was out or warranty I was looking at having to pay it myself but I knew enough to ask about participation from GM and the dealer checked with them and GM agreed to limit my cost to $1,500. While I appreciate having to pay only $1,500, this is a problem that should never have happened and it obviously started well before my warranty expired. Given that the recall obviously didn't work and the circumstances I think GM should have picked up the entire amount. GM decreasing their powertrain warranty from 100k miles to 60k miles says a lot about their confidence in their engines.