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303 protectant is the way to go...

We run a 04 WRX wagon locally... Dstock, SM and now ESP. For the last few years... All on Amsoil 5 w40 euro. Works great for us... Even the SSO 5 w 30 should be fine... Our engines are really not hard on oil, even with the boost turned up... It is a lack of having the right amount of oil and not...