So some background before I start...My grandfather was a Service Manager for a GM Dealership for roughly 40 years and he still goes back from time to time to ask about things. I sent him on a mission to find out what the Techs, Service Manager think since they tell him the "Truth" vs. what they would tell a common everyday customer like most of us....here is what he came back to me with....
He says: The techs and the Service mananager are seeing people waiting way to long to change thier oil.....in this case the way the engine is designed is with small holes for oil to get to the timing chain location....the tensioner is what wears out first with the very used oil which will cause the premature wear. He also said that there is a whole lot of people that have 2009's that have been changing thier oil at closer intervals (3000-4000 mi. like me) that are not having this issue. So the verdict from his service manager and techs, was CHANGE YOUR OIL MORE OFTEN, since it will be BY FAR the cheapest thing you can put in your car VS. $2000+ for a timing chain repair.
He also asked why the TSB for older and not newer. The Service Mananger told him that 2010's have the new programing for the ECM. Service Manager also told him there may be a few of the early manufactured 2010's with the old program in there. GM was waiting for a certain number of fails before reacting to the problem/ they were finding the best way to go about fixing this with out causing customers loss of vehicles for multiple days for a Timing Chain Recall. 45 mins for reprogram VS. 3-4 days for timing chain repair.
I know this is just what an old man told me but with his history of working for GM for 40 + years I have a tendency to sway his way on matters like this. Hope this helps and of course I can elaborate more if wanted. This is the Cliff Notes version...
He says: The techs and the Service mananager are seeing people waiting way to long to change thier oil.....in this case the way the engine is designed is with small holes for oil to get to the timing chain location....the tensioner is what wears out first with the very used oil which will cause the premature wear. He also said that there is a whole lot of people that have 2009's that have been changing thier oil at closer intervals (3000-4000 mi. like me) that are not having this issue. So the verdict from his service manager and techs, was CHANGE YOUR OIL MORE OFTEN, since it will be BY FAR the cheapest thing you can put in your car VS. $2000+ for a timing chain repair.
He also asked why the TSB for older and not newer. The Service Mananger told him that 2010's have the new programing for the ECM. Service Manager also told him there may be a few of the early manufactured 2010's with the old program in there. GM was waiting for a certain number of fails before reacting to the problem/ they were finding the best way to go about fixing this with out causing customers loss of vehicles for multiple days for a Timing Chain Recall. 45 mins for reprogram VS. 3-4 days for timing chain repair.
I know this is just what an old man told me but with his history of working for GM for 40 + years I have a tendency to sway his way on matters like this. Hope this helps and of course I can elaborate more if wanted. This is the Cliff Notes version...