It could also just be air in the coolant. Try bleeding the cooling system.
It is only oil if the coolant appears to be "milky". This appearance would
tend to remain even after you had finished revving the engine.

Dominic.

"Steve Collins" > wrote in message
...
> Hi,
>
> I've just noticed that when revving the engine on my 156 2.0TS, bubbles
> appear in the coolant filler bottle.
>
> My suspicion is that this means the head gasket has failed but the car has
> no other symtoms of this - it doesn't seem to be getting oil into the
> water or water into the oil etc.
>
> Anybody else seen this?
>
> Cheers,
> Steve
>
>