Thread: Oil Advice
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Old 18-12-2006, 09:10 PM
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5w30 is probably a bit too thin for WRX.

The reason I use them is because the RS Liberty and to a lesser extent the Legacy RS/GT have oil supply issues in the head and can cause oil starvation of the lifters and hence cause tappet noise. Legacy's like mine are less prone to the problem as the JDM heads are slightly different and have better flowing oil galleries in the heads than the aus spec RS. But running thinner oil like the 5w30 helps.

I would recommend 10w40 for WRXs.
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