I have a '08 Cobalt. At 97,000 miles, the head had to be rebuilt (warranty). At 114,000 miles, the #2 cylinder had low compression and the engine had to be replaced (GM Goodwill warranty) with a new crate motor. I have recently talked to another person with a '06 Cobalt that had the same problems at 38,000 miles and her engine was replaced also. All of my driving is on the highway. I drive 70 miles (one way) to work. Just curious if anyone else haas had this problem. Thanks, Steven