Vehicle: 2016 Chevy Colorado with 2.8L DIesel engine. 2 wheel drive. Some light towing. Sweet engine, I've seen over 30 mpg in highway driving, up to 34 sometimes. I have used up the free dealer, generic, AC Delco Dexos2 oil changes for this vehicle. From what I understand, the most readily available, premium oil for this vehicle would be Mobil 1 5W30 ESP. That is going to be my "go to" oil moving forward. However: When I look at the Mobil 1 website, I notice that there is another Dexos2 oil listed. There is that Mobil 1 0W40 ESP - also listed Dexos2. Slightly higher HT/HS, Corvette recommended. For kicks, when I called an ExxonMobil distributor, I was shocked to see that it cheaper than the 5W30 ESP. $46/6 quarts vs $54/6 quarts. Neither one cheap, but as they say, " oil is still cheaper than engine parts". ONCE I AM PAST WARRANTY, is the 0W40 a better choice? I note that the very similar, (origin) Ram diesel oil recommendation is now 5W40, up from 5W30. Why? To complicate it more, the discontinued, Mobil 1 5W30 ESP Formula has a both a higher listed flash point, HT/HS and lower ash content (.60) than the two listed above. I can still get my hands on some if it is worth (out of warranty). There is even a discontinued Mobil 1 5W40 ESP available at some places. What to do?