creedy mate i wouldnt be driving or racing your car!

if you have white sludge in your filler cap and a loss of water after running you almost certainly are burning water etc which would indicate a head gasket failure possibly worse

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im pretty sure i know the source of my problem (it split a water hose and went tits up)

im gunna strip my head off tomorrow so please if any one can describe or show photos of a failed head gasket that would be top