If oil was in your coolant it would go all milky and frothy with bubbles of oil floating at the surface.
Do you know what brand and type of coolant you have in there? There are some coolants that change colour to let you know its time to change it.
If you intend on changing the coolant, make sure to flush the old stuff out completely. You shouldnt mix different brands of coolant.
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RS Liberty - Because WRX's are only good for parts...
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