I'm not fond of oils that don't have API/ACEA approval either.
But I have to wiegh that against the fact that RL isn't a shady operation. That they operate the world over. That I can buy it in an actual brick and mortar store. That they don't rail against third party UOA/VOA tests.
Amsoil is a good oil as well. And XL is API certed. But, not one I use.
Warranty wise, I don't think it's an issue with the users in this thread.