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[Kevin Wood]

I could be wrong but I thought it was more the 3.0.

True. Didn't spot that this was a 2.5 but the failure, as I understand it, is due to breaking up of the composite material of the head gasket in the water jacket areas which then eventually eats through between jacket and the outside world.

I'm not sure the engine capacity would make much difference, assuming the same type of gaskets were used. It could have been a bad batch of just 3.0 gaskets though, of course.

Kevin

[Kevin Wood]

Another thing to check is the O ring where the coolant transfer pipe from the bottom rad. hose meets the back of the block.

Not easy to access but worth stripping off the plenum, intake manifold and scuttle cover and then pressurising the cooling system to see if anything can be seen IMHO.

Kevin

[Entwood]

One thing you could try before resorting to the snakeoil treatment, although it does mean a new lot of antifreeze ...

Drain & flush the system so you just have clean, fresh water in it. Then add 2 bottles of bright yellow food colouring ... I think they are about 25 cc each bottle. Wipe the engine as dry as you can then run the engine at tick over until fully warm, watching all the time for your leak. The bright yellow water is much easier to see. 

Once you've found the leak .. and depending on where/what ... drain the system and flush fully to remove the dye .. then add 5 ltrs anti-freeze, top up with clean water.

[amba]

Brilliant idea with the coolant colour additive,but I am certain of general area of leak its just I cant get to it.
I will live with it for another month or so and keep topping up coolant as required as sais before the leak is only minor (at the moment)
Will then find a warm !!!! dry !!!! day and pull plenum/etc off and give it a pressure test.
My money is on the coolant bridge area or oil cooler plate as with car on stands and jack with inspection light drips seemed to be higher than joint of head and block,and don,t want to start adding sealer to the system .

[Kevin Wood]

I believe Jimbob had an issue with a leaky core plug up at the back of the engine somewhere.

Kevin