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I got a low coolant light pop up, i checked the reservoir and it was almost empty and there was little bits of brown foam (guessing its oil). I filled it up with distilled water and bmw coolant (originally had bmw coolant). noticed leaking on the passenger side of car at first when i was out but in my garage, i saw a leak behind the engine, like in the middle of the car. any guesses? where is it leaking that oil can get in it?

car is awd automatic 335i 2009

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If there is Oil in the water it could be from a blown head gasket, or possibly a crack in the block or head. Is there any water on the oil? it tends to form a light coloured sludge if there is.

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