Pepperidge
Member Advocate
Here's a link to some info on it...
http://news.pickuptrucks.com/2009/06/spied-gm-2011-heavy-duty-lml-duramax-diesel-engine.html
http://news.pickuptrucks.com/2009/06/spied-gm-2011-heavy-duty-lml-duramax-diesel-engine.html