So, I had a chat with the service manager, and the mechanic at the Chevy dealer today while lovely spouse was getting schooled on all the Equinox buttons by the delivery folks. They have had zero issues with the Traverse DI engines, including an 08 with about 80k on it. This particular Traverse is mostly highway driven, and the owner returns to the dealer for a change when indicated by the OLM. The dealer uses bulk Valvoline. This is not to say the intakes are not filthy, but they have not been into a DI engine because of that issue, which is somewhat encouraging. They (the service dept) recommends (obviously) 3/3k OCI's for all engines. He did not have a preference for conventional or synthetic, but said they use M1 if a customer requests synthetic. He also said that GM is beginning to realize that the OLM "IN SOME CASES" (his words) is overly optimistic. They had a Trailblazer in one bay, engine removed. The TB had 80k on it, and had spun a rod bearing. This car had followed the OLM, and it's last change was 11k on the same Valvo conventional mentioned above. Now it may just be this guy talking, thinking he convinced GM that the OLM needed tweaking, or maybe his statement is accurate. I don't know. I do know that my Envoy survived very well on 5k OCI, and I see the new Equinox doing the same.