Really interesting Oil Filter study

[Evan]

Purolator here w/ Mobil 1 5w30 ^_^

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For a turbo car, I'd recommend going with the Euro Formula M1 10w40 - the 5w30 stuff is just too thin.

M1 5w30 is fine for the WRX. Its what the manual recommends, and what I used for however many thousands of track miles on mine.