i have oil in the header tank (water exspansion tank) i do not have over heating or running problems,what is wrong?
Is it engine oil or trans fluid? OIl is black, trans is red. If it's oil, then I suspect your headgasket would need replacing. If it's transmission fluid, you'll need to replace your radiator, since the seal between the transmission cooler and radiator was compromised. In both instances, your coolant and engine/transmission will have to be flushed. Discontinue driving, as you don't want anymore water mixing into the engine or trans itself.
Good points by Tom, In addition to narrow it down even further there are a few things you can do. Check your oil for a white creamy-ness. Drain some oil into a pan and if there is water in the oil it will look brown and milky. With engine cool remove radiator cap and start car watch closely for bubbles coming up into filler neck. If they seem rythmatic and steady look for head/head gasket. You can do a pressure test on the radiator system.If there is a leakdown look for head/head gasket or bad radiator.
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