5w-30 will be fine in your engine, like i said, mines done 230000 and I still use it in my car.
I think there is a thread somewhere explaining what a viscoscity rating means, eg, 5w-30 means the oil has the properties of a 5w when cold and the properties of a 30w when at OT.
It will still protect at start up and a cold start as it flows easily, plus EJ engines have huge oil pressure when cold, plus the 5w allows the engine to get to OT quicker.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i