Thanks peeps,there is no crap on the oil filler cap,its spotless in there.It has been putting bits on the inside of the header tank cap for a while i think but no loss or hot running what so ever.I would be suprised if it is the hg now.The car gets used nearly everyday and as soon as its warm it gets used in anger with no problems.I am thinking now as its the modine thingy now.Bugger