[racingvette]

. So long as the oil you use meets or exceeds the manufacturer's SAE recommendations you'll be fine. I don't waste money because I think one brand is better than another. I have never had an oil related failure in any of the cars I have owned.

Totally untrue and nothing but a marketing ploy.
I finally ceasing vendors claiming they meet or exceed GM specs which they never had GM test
GM changed the policy 5 years ago that to maintain warranty the oil had to be on GM's certified list which many of the oils marketed are NOT which means they are also not GM approved.

To deep six all this GM has come out with a new oil standard called dexos and all 2011 cars will have to meet.

 

[racingvette]

Bunk

No vendor in a court of law when your trying to sue GM for voiding your warranty for non approved GM oils can claim or prove they meet or exceed GM internal specs when they have not been tested by GM to even know what the test methods or requirements are or have letters from GM saying they passed the tests and are approved.
API is no longer the sole passing as oil also must be GM certified.

Fostering others to change oils just for your bias of oil vendors is misleading at best as it is their warranty, not yours that would be ripped up

Yes GM can test and know what oil is used and there is public cases of Corvette owners losing warranty over non approved oils and fluids

That content you post is useless as it was with old GM standards and requirements.

If it is not broke, do not F with it and Mobil I use has never been shown to cause any damage even in early C4s when it became GM engine oil standard for Corvettes.