IDK, this truck has been out for far longer than 1 year, and there should be other options by now. They're already on their third model year for the 3.0. GM just doesn't want to share the customer's business. There are two DexosD oils but GM only lists 0W20. The other is 5W30 which has a higher HTHS rating. Amazingly enough, the stock 5W30 Dexos2 for the Colorado looks like it meets the DexosD rating. The Amsoil Syntheitc Diesel 5W30 oil covers both the Dexos2 and DexosD ratings (per Amsoil). Since the 2.8 had two oils (5W30 and 5W40, which I used during the summer for towing without issue), I'm really leaning toward replacing the 0W20 with the 5W30 Dexos2, even if it's only for a few months.