Question about 1994 Mercury Grand Marquis

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Oil mixed with water

Head gaskets looked undamaged

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This may be pricey to fix some models had an external oil cooler in the radiator as with automatic transmission lines, others had one in the block itself..they were steel lines subjected to vibration and rust..only other thing I know is maybe a failed freezeplug under the valvecover somewhere or in the inake assembly..ultimately you may have a cracked casting somewhere and those arent easy to find.. good luck

Posted on Jan 13, 2013

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Posted on Jan 02, 2017

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I have water in the engine oil. Could it be a water pump seal or a blown head gasket?


When you say that you have water in engine oil, do you mean that you have coolant mixed with oil ?
In order to determine if it's a seal or head gasket, you will need to perform a few tests. Cylinder leakage test on each cylinder can be done to determine if the head gasket is bad. When it comes to the water pump seal, if this was the problem, the coolant would not be mixing with the engine oil.

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The only place, oil and water share a gasket is the cylinder head gasket, oil and water galleries run through the engine block and head via the head gasket. The cylinder pressure will be OK, it's the oil pressure that's putting the oil in the coolant, the gasket has gone between the water and oil galleries or there is an internal crack (unlikely). A coolant pressure test should show it up.

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Jan 13, 2013 | 1994 Mercury Grand Marquis

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have you checked your engine oil if it looks the same?? If your engine oil is mixed/milky colored, then its your head gasket!!hopefully this helps!!

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Blew oil out of the water resevoir


We just had the exact same issue with our 2004 F-350 with a 6.0. The oil cooler had failed. Its an expensive fix. But less costly than a blown head gasket.

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Audi a4 mixing water and oil together hissing,grey/brown foam


That is not true oil and water being mixed can come from many different places. Such as a bad radiator which would cause transmission oil to mix with the water also alot of audi's have a water cooled oil cooler which are a very common cause of oil being mixed with with water. These type of oil coolers are located under you oil filter. They have water lines hooked to them which cools the oil and when they go bad the water and oil will mix. So dont be convinced that its your head gaskets it could be but not as likely. You can pressure test your oil cooler to see if this is the problem just romove it an plug one off the inlet or with rubber plug which can be purchased at you local hardware store (I found mine at ace hardware in there specialty drawers where they have all there bolts) then attach a air hose to the other outlet pressureize the system and place it in a bucket of water. this should tell you if the oil cooler is bad but be careful not to ove3r pressureize the cooler this could damage it and caust it to leak. 15 to 30 psi should be plenty.

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OIL IN ANTIFREEZE


Everyone automatically assumes that oil and water mixing means a blown head gasket or cracked engine block. Of course common sense is usually not that common. Oil in coolant is a different problem than coolant in oil. The former is a low pressure leak, and could indicate only an intake manifold gasket. It could also be an early or small head gasket leak. Coolant in oil is usually a cracked block or torn head gasket, and has concomitant symptoms of white exhaust smoke and milky oil on dipstick. If you replace the head gasket and the problem persists, an intake gasket could have fixed the problem.

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