Well one problem that you might find eif you decide to go with G-05 is the manufacture will not necessarily list all the ingredients the AF actually has in it.
So say you get a bottle of Zerex AF that says G-05 on the front. It might not list silicate on the label, but keep in mind it doesn't list borates or nitrites either that G-05 can contain. But as long as its a reputable brand like Zerex and says G-05 and especially if it say "approved", and not just "meets" or "recommended" by one of the automakers known to use G-05, for instance M-B, Ford etc, then you are getting the real deal.
So say you get a bottle of Zerex AF that says G-05 on the front. It might not list silicate on the label, but keep in mind it doesn't list borates or nitrites either that G-05 can contain. But as long as its a reputable brand like Zerex and says G-05 and especially if it say "approved", and not just "meets" or "recommended" by one of the automakers known to use G-05, for instance M-B, Ford etc, then you are getting the real deal.