" If the motor is stock 4.0L the 91AA will have little effect on it. I may have a 94AB here but need to come off the block, not sure on corrosion. "

Thanks SWC , dont go to any trouble , I can get one from Pick and Payless for $80.00 but I'd rather give the money to someone in here , but like I said if it is still on the car don't go to any trouble .

Cheers Kenny

" Half a litre of coolant a month isn't much...especially if you suspect a head gasket. I would say look else where for a leak. "

It must be the head gasket as there are no extarnal leaks . I did the water pump earlier this year and radiator and all hoses the year before last . The low water warning light comes on about once a month and it takes about half a litre to top up the expansion tank .

B T W Thanks to all for your responses , much appreciated .

Cheers Kenny