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I have only just done my coolant about 5 months ago.
Does this mean I have done a head gasket?
Looks like one of the plastic intake manifold gaskets has cracked and is leaking oil into the coolant and will get worse , these get brittle over time and I've heard they should be replaced at 150,000Ks ... I'd recommended you buy a pair of the aluminium ones you can get from Mace Engineering for about 95 bucks ... why the hell Holden never fitted them instead of the plastic ones (like the in the US Buick V6) is beyond me ... as said above, its a common problem and easily fixed but I'd go for the aluminium gaskets especially if your going to keep the car