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.
People like rotella because it’s a high zinc oil and subarus just like high zinc.
I run the Rottela 15w40 in my stock 05 Subaru Legacy GT (EJ255) and my mk4 supra turbo. Haven't had issues with the cats on the Subie, I do plan to remove them tho
Rotella 15W-40. I put that shit in everything. My Yukon, my Fit, and all 3 motorcycles. It’s legit.
We used to commonly use Rotella in our heavily modified Mazdaspeed 3/6's to combat the same issue. It worked great and the only problem we ever had was with what we called the "black death".
Redline 5w 40 since break-in, 254k miles later engine still going strong. Plenty of other repairs done, but no internal engine repairs required.
Rotella T6 5W40
I run Rotella T6 5w-40 full syn Heavy duty Diesel engine oil in all my small engines with good results. Scooter, ATV, lawn mower, Honda car, and my F350.
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