Cookie I had this happen to a PSD.
QUote from the Ford manual,
Engine Oil Cooler
If oil is found in the cooling system, OR COOLANT FOUND IN THE OIL, the oil cooler should be checked for leakage as outlined under Oil Cooler Internal Leakage Test in the Service Procedures.
Apperantly the oil that is sent through the cooler is bled off and not pressurized as high as the pump can put out.
Last edited by Cuda_jim; 08-11-2006 at 05:00 PM.