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Your engines head gasket is blown. This means a cylinder will lose a little compression because gas can escape into the cooling system. Doing so forces oil into the water, and water into the cylinder when the piston is on the down stroke. This overheats your car puts extra stress on your cooling system because it becomes even more pressurised (you will need to top up the cooling fluid very frequently because of this). Get it fixed as soon as possible before you do more damage to the cooling system or the engine. Your mechanic will know that the oil and water in the car will also need to be flushed once the head gasket is replaced.

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Q: What causes antifreeze to mix with the oil or vice versa and make the car to overheat?
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Related questions

Why does A Pontiac Grand Am overheat when driving?

The antifreeze level could be low, or the thermostat may need to be replaced, or the antifreeze line might need to be blead to get all the air out, the air in the line will make it overheat.


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your cooling fans are not kicking in. They make have clutches that have gone bad. they need to be replaced. Also check the themostat


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If you're stuck in traffic and your water is low, even a little, it will overheat... or your thermostat is not opening all the way. Or your fan is not kicking in at temperature. Make sure your antifreeze is properly mixed, beause it is a coolant, too.


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Blown head gasket.


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