I have noticed that a LOT of folks here on this forum seem to take the dexos thing personally.
They complain that dexos is GM strong arming the oil companies into paying them these obscene fees and that the price for a quart of oil will go way up. As a consumer I see no price difference between dexos oils and non-dexos oils. If Valvoline and Amsoil are saving such a boatlod of cash by not paying GM's exorbitant fees, then their oils should be far less expensive. This does not appear to be the case.
Is it because some of the oil religions are being offended? I think so.
I look at it this way, GM is giving a 5 year 100K mile warranty on the drivetrain, they want to make sure people are using quality oil and doing their maintenance when they are supposed to. Trust me, working for 6+ years in the quick lube industry, I have seen more than my share of people that only maintain their car when something goes out. You would shudder at the people that only change the oil when the oil light comes on???!!!!
I don't blame GM for putting restrictions, I would do it as well.
2013 Chevrolet Silverado LTZ 2WD 5.3L
Amsoil Signature Series 5W-30