Originally Posted By: jhellwig
Gm is having a few issues on timing chains on overhead cam engines. That is one of the things that the magical dexos is supposed to fix also.
I haven't kept up to date on the Ecotec chain-breaking issue but when I read up on this the prevailing thought was that it was the tensioning system causing the porblem, not a lube issue.
At least thats what my uncle was told when he bought one with a rebuilt engine (at 55K) they told him that a redesigned tensioning system was installed and there was no reason to worry about it...
Has this been revised in the past couple of years?