I have a 2005 Peugeot 307 hatchback.
Back in May, the head gasket blew so I had it replaced. When the head gasket blew, oil was leaking out and the coolant became very gungy. This gunge was cleared out, but not completely.
About 2 weeks ago, I checked the coolant and oil. The coolant was fine, but I topped the oil up.
Now, I just checked both again. The oil is fine, but the coolant is very gungy and oily, with a dark marshmallowey colour.
I have done about 3000 miles since the head gasket was replace. There is no oil leaking out of the car and the oil level seems the same as it was 2 weeks ago.
I'm not sure whether this is relevant, but since the head gasket was replaced I have gone from doing long distance journeys to stop-start city centre journeys.
Could anyone give me some indication of what the cause is or whether there is anything else I should check?