Found this tidbit about dexos and GF-5. asashop.org
Seems to be another way to up the prices. 15% for GF-5 and up to 30% for dexos. Seems to be GM's way of getting extra profit, since they were bailed out? Dexos for sparkers seems to be 0W-XX and the diesels are 5W-XX weight. Mostly Grp III PAO's for dexos.