Too bad the spider charts are so dissimilar in peaks. The first spider has dexos equal or higher than anything ILSAC. The second shows GF-5 beating dexos1 in a few categories, buy a considerable amount. And considering GM is such a major proponent of E85 with it's flex fuel vehicles, you would think that their dexos1 spec regarding E85 would be light years ahead of GF-5, but it falls way behind GF-5 on the second chart.