I believe Subaru allows for 5w-30 conventional as an alternate in the manual in the case 0w-20 is not available. If you’re interested in Amsoil 5w-30 Signature is their flagship. Signature 0w-40, 10w30 and 5w-30 would be excellent in your application. Amsoil XL is also a good option if your looking for something a little more economical.