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I just had triton put in what they recommend the best oil for the impreza castrol edge 10w 60 has made a difference in engine noise a lot quieter on cold start
i always used shell helix 10/40w semi on mine because thats what subaru had used on its previous services before i got it,i also changed it 2/3 times a year the car was running 290bhp and on 112,000 miles and the engine was running perfect.
i know alot use more exspensive stuff but i didnt and mine was fine never let me down and no engine issues.