I've only had my Aveo5 for a week, but just replaced the valve cover gasket. I replaced it cause I saw some seepage from the old gasket. It was super easy to do and only took about 2 hours. I don't have a small torque wrench, so I snugged all valve cover bolts to what I felt was the spec'd 89 in/lbs (7.4 ft/lbs).
The part I got from Advanced Auto Parts was the FelPro VS 50730 R
It cost me $30 and about 2 hours of my time.