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Yellow or white fluid mixed with oil is usually water. Check the level of your coolant. If the coolant is low, there is a possibility you have a cracked head or bad head gasket. A small amount of yellow/white fluid in your oil can be caused by condensation, a missing or loose oil fill cap, or even a bad oil pan gasket. Another possiblity is that oil which has not been changed over a very long period can absorb water. It could be water that has emulsified. Remove some of the oil and let it sit for a while. If water or anti-freeze separates to the bottom you are leaking coolant into the oil. The quad 4 has a history of head gasket and cylinder head problems.

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Q: Why is there is a yellowish substance in the oil of a 89 grand am Quad 4?
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