This is absolutely ridiculous. If you guys want to believe it's the same fluid, just close your eyes and keep telling yourself that and maybe it'll come true. Dexron VI is a trademark of GM (not a patent), and to use their trademark, you have to submit your fluid for testing. As long as it passes their test and you pay them a bunch of money, you can use the name. Most Dexron VI fluid on the market is marketed as semi-synthetic, it's a combination of Group II and Group III basestock. Then there's Valvoline that's marketed as full synthetic, it's all Group III basestock. You're telling me they are the same? Give me a break.
SAE sets the viscosity standards (5W-30, 10W-30, etc), you're right, though, API sets performance and additive standards (SJ, SM, etc).
Bob Is The Oil Guy
