3 months ago we did one side head gasket becouse water inside oil but now i have oil inside the water reservor 1999 ford expedition 4x4 5.4l
the water reservor has engine oil on 1999 Ford Expedition
Engine oil or transmission fluid? Radiator contains the trans. cooler and may be defective. Not sure but could have oil cooler in radiator as well in any event check or have rad. checked first!!
could it be possible residual from head job try to flush coolant ,clean bottle for overflow and see if it returns