Is your Subaru DI or turbo DI?
I like a3/b4 stuff and typically don't pay attention to owner's manual recommendation (CAFE) but when it comes to DI or Turbo DI, I'm a little more careful about oil selection and consider illusive lspi, ivd, ash contents, low/mid/full saps, etc.
ask @edyvw
Still not really convinced if any of it makes a huge difference in the long run as I haven't seen any independent studies (long term, same engine, different oil kind of studies) ... but meanwhile something to think about.
For what it's worth back when Subaru began using a GDI engine in the WRX (model year 2015) many thought that they could just put the choice oil of the enthusiast crowd, Rotella T6 5w40, in that engine and get good results like they got in the past. What happened though is their dashboards lit up like Christmas trees with check engine lights that would not go away.
I know it's the cool thing on BITOG to use something other than the recommended oil, all the cool kids are doing it and everyone wants to be one of the cool kids. Here are two oils I, being Mr. Subaru, would recommend:
Valvoline Modern Engine 0w20
Valvoline Modern Engine 5w30, if you must use something other than 0w20.