Engine oil Shell or OEM Subaru

I have used full synthetic Rotella T in my bikes for the last decade with no issues.

My 93 loved and my 94 loves Rotella T6 5w40????????

For the FA20, I like Rotella T6 Multi Vehicle 5w-30.

Engine runs super smooth with that oil.

I use rotella 5-40 in mine. It's really cheap for a full synthetic and I saw less oil consumption after switching. It's intended for diesel engines but I haven't seen any negative effects after using it for 60k miles. I usually change it around 4k miles.

I use Rotella 10-40w Diesel oil. works great.

I used Shell Rotella T6 5w-40 for a while (not cat AND Sohn installed) and it was fine.

I run Brotella T6 5-40. 22.50 a gallon from amazon. Fantastic Stuff.

If you look at the forums there’s tons of information on this. The rotella T6 5w40 is considered to be the best oil for the EJ hands down.

I run 15W-40 Shell [B]Rotella in my Volvo because it's an old turbo car and the enthusiast community has had success with it.

These days I do use T6 because I know the winters in south Texas aren't cold enough to worry about running anything lighter.