sailaingjj

Thanks for your responses guys, I also wondered if it could be this but I understand that both the engine oil and the gearbox oil pass through the radiator to be cooled so it could be a leak in the radiator somewhere. I wondered if anyone had experienced the problem specifically with the XK with its complex cooling system. I would like to know if it is common and how the cause of the problem was diagnosed. Thanks again, Jo

I have recently bought a 5 year old XK5.0 from a private trader with less than 20,000 miles on the clock. I found oil mixed/floating in the header tank. The local J dealer did some tests and said they could find nothing wrong so they removed the header tank and cleaned it out and flushed the coolant. All semed well for 100 miles so concluded someone had put oil in the header by mistake. Now after a few hundred miles of motorway driving, the first signs of oil are reappearing, some emulsification and maybe a teaspoonful floating in the surface of the water. What is the next step in getting to the bottom of the problem? Any help much appreciated. JJ