There are possible issues (fuel dilution and carbon deposits) in m(any) direct injection engines which as you know are in all the 09 Lambda platforms...including the Traverse.
I have done 2 consecutive analyses on our Traverse:
i.e the factory fill and then a run of QHorsepower. I stuck with the QH again and this week will complete a traditional 3k mile interval (probly high 60% on the OLM). I will sample it and replace again with QH and another PF48 and if the latest sample shows fine I will run the OLM to 50% into a Canadian winter.
Hope this info helps.
I will not be following the OLM. I don't trust it. I have a 2008 Impala and the oil gets black around 3k miles but the OLM say 70% oil life remaining. I was planning on running Pennzoil Platinum 5w30 and continuing with a 5k mile OCI. I was unaware that the DirectInjection engines could have contamination issues.