I removed the valve cover to replace its gasket on my 2006 Chevy Aveo, 1.6L I4. The car has 205K miles and has used M1 5w-30 with 7500 mile OCI's since new. I don't know if the pictures will be good enough to see. The cams have only a little bit of burnishing of the surface but no evidence of anything that I would call wear. Absolutely no sludge or dirt in there either.
https://picasaweb.google.com/10088130856...feat=directlink
Disclaimer: I realize that this isn't any type of scientific test. Just posted for those who might be curios like me.
https://picasaweb.google.com/10088130856...feat=directlink
Disclaimer: I realize that this isn't any type of scientific test. Just posted for those who might be curios like me.