@dragos_st
Maybe the Mondeo cooler isn't doing enough. Are you sure it's still overheating? The 13 row oil cooler on mine is very effective at keeping the fluid cool, but I still find that the cap leaks under hard cornering even though the fluid isn't hot... it actually just spills out from the cap as the seal isn't very good. I have bought a slightly bigger Viton o-ring to make the cap a better seal for track although I haven't tested it yet.
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2005 Fiesta ST - wrote off
Newman fast road cams, Fusion Fabrications custom inlet manifold, custom exhaust