Outside of a failed head gasket, the most common reason that you would find oil in your water is going to be a cracked cylinder head. Common reasons that the cooling system fails are: When it fails, it is protecting your Grand Prix from even worse damage by relieving the pressure on the head before it can crack.Ī head gasket will fail when your cooling system can no longer keep it cool. A head gasket is supposed to have a lower failure temperature than a cylinder head. While a failure of the head gasket is the most common reason, there are a few other reasons as well.įar and away, the most common reason that you would find water in your coolant is a blown head gasket. There are only a few reasons that oil would be in your Grand Prix’s coolant. Oil in Coolant Causes: Pontiac Grand Prix You may still have some in the reservoir. It doesn’t take a lot of coolant to make the oil look milky. If left unattended for long enough, and enough water gets in, your Grand Prix’s engine can lock up. This indicates that your oil is losing its viscosity. If enough coolant gets into your oil pan, you may start to notice knocking and pinging sounds. The most common symptom of oil in the coolant will be that the oil is “milky” or “creamy” in your radiator, or on your oil fill cap. Pontiac Grand Prix Oil In Coolant Symptoms It can also be caused by a cracked head or even a bad radiator (well sorta, you’d be looking at transmission fluid and not oil, but it looks rather similar in the coolant). Oil in your coolant is most often caused by a blown head gasket. If you’ve recently checked your Pontiac Grand Prix’s coolant, and it looks almost like it has butter in it, then you probably have oil in it.
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