Join Date: Jul 2009
Location: Sunshine Coast,Queensland, Australia
Drives: 2005 Kia Cerato LD [2L petrol] manual, 1986 Nissan Pulsar hatch
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Unfortunately you may have a water channel in the head that has corroded and is now in contact with a oilway. If it is milky white in the radiator this is the most likely cause, also check to see if you are getting bubbles in the radiator top tank when the engine is running. Pull out the spark plugs and check the condition and look for moisture on the plugs. If the plugs are getting wet I'm afraid the head will have to come off to investigate further. A compression test would confirm if the head is at fault. The only other thing I can think of that may cause a similar problem is that if your car is an automatic and has an oil cooler that is leaking into the radiator[ I'm not sure how transmission fluid would look if mixed in the coolant] but I think you could tell by the smell.. If the colour is mustard like you say I think it is more likely to be transmission fluid because engine oil would show up milky white.
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Last edited by pulsar86; 02-07-2010 at 03:03 PM.