Engine oil Shell or OEM Subaru

Shell Engine oil

It's perfectly fine for the WRX, and it's what I use in mine, as well as its two previous owners. My car's maintenance records include two reports from Blackstone Labs detailing their examination of the Rotella T6 5W-40 oil and according to those the engine has worn very well on that oil

Pros: engine has worn well
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Shell Engine oil

I personally swapped from 5w-30 in my OBXT to T6 5w-40 and have noticed a decrease in oil consumption (newish engine with 28k so that also helps).

Pros: decrease oil consumption
Cons: catalytic convertor wear
Mileage: 28000 km
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Shell Engine oil

Walmart. Shell Rotella 5qt for $20. Or Mobil1 for less than $25 if they're out of the Shell and K&N filters always in stock.

Pros: good price, always stocked
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