I think the head gasket/s has gone on my 2.5 V6 Omega. I have brown sludge in the header tank. The oil cooler was done about 4/5 months ago at Vauxhall and was told that it may be some sludge left from then. So i flushed the system through and re-filled with coolant. After a 3 mile run, the header was full of sludge again!!!!!! I did hear a slight gurgling around the engine aswell.
Now am i right in suspecting the head gasket has failed??
I'm sure it cant be the oil cooler as it was only done about 5 months ago. There is no water in the oil, on the dipstick or filler cap.
There is also no noticibale loss in performance, which i always thought there should be with failed head gaskets(?).
Do the V6 heads go porous?? If it is the head gasket would both need replacing?
Im assuming its a difficult job. Any idea how much it would cost at vauxhall?