The same acite and water cordoba 1.9 d 1y

Hello
if as it seems it is possible that it is a fissure, they know some product that mixed with the
water can plug the fissure.
Well, lifting the cylinder head will be the last
thank you ..

Anto do not listen to what you tell you, change more than 60 SEAT oil radiators even Audi and it was always the oil radiator because they are very thin walls and people put normal water that quickly attacks aluminum and it is drilled mixed with water.
If it were the cylinders Veria water in the motor oil.
Clean the expansion bottle, start the engine and when the water circulates you will see oil again because the circuit is dirty and how float oil tends to accumulate in this bottle.
If you don't believe what I say, go to a professional mechanic
before lifting the cylinder cover.