Re: Opinions on oil life indicator
A few thoughts. Cadillac and Corvettes for years factory filled with Mobil 1 synthetic. They now brand there own Dexos 1. If you go to Mobil the only oil meeting the Dexos1 spec is Mobil 1, a full synthetic oil. Synthetic oils though not sold as extended drain oil (Mfg want to keep sales volume) have the ability to not break down and can be used for extended drain. Many truck fleet use synthetic oil and go 50,000 miles between changes.
Also crankcase capacity have doubled from the 3000 mile era, that alone doubles oil change interval. You should not be concerned about longer drain intervals.