You would think that trying to help consumers get the right information is what everyone should be all about. Take a look at this thread in Edmunds. Manufacturers proprietary specs for engine oils are normal for today's cars and GM's dexos is really only one example. To see people twist the debate in a way that works to try and raise the suggestion that it isn't necessary to follow GM's reccomendation is wrong.

Start by following the thread from this post for now. http://townhall-talk.edmunds.com/direct/view/.f258f92/1071#MSG1071

Feel free to take in the entire thread if you have time.