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Q: why does the antifreeze feels greasy and has milky texture/color? on 2003 Audi A6 Quattro

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I think some oil is leaking into radiator. What would caused it? How big of job is it to fix it?
Several possibilities , trans/oil cooler in radiator has failed and leaking oil into coolant , or headgasket/cracked head issues. What other symptoms/problems does the vehicle have?
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