I’m not arguing amsoil isn’t better, I use it all the time but if your dealer says they won’t cover it Then why go through that head ache and they will void warranty’s on vehicles not using fluids with the proper certifications, you basically sign a warranty contract when you buy your vehicle that states you will use fluids with the required certifications. Now it doesn’t have to be GM oil just has to be certified. It’s funny because Walmart supertech engine oil is dexos certified so it won’t void the warranty and personally I want to stick with the factory warranty with the oil warranty as back up, it’s why I use Mobil 1 oil. If the atf meet cert, which it might because there’s no silly GM dexos cert for it, then by all means I’d use that over factory fill. Amsoil has a fantastic base and great additive packages, better than Mobil 1 in most cases.