Coolant or antifreeze problems

Coolant or antifreeze: Green or pink-colored liquid specifically designed to be used inside of the engine as a refrigerant.
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Oil getting in to expansion tank

Audi A4 2002 i.9 tdi estate 180000 miles
Oil is getting in to the coolant.It is not sludgy looking.It is black floating on the coolant Expansion tank cap is also oily Could it be the oil cooler causing this The car is not over heating
decky from Ireland 5 years ago  
DE
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