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Oil in Antifreeze

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Old 10-11-2008, 08:04 PM   #1
FORD TOUGH
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Default Oil in Antifreeze

I'm thinking about buying a 96 Mustang GT. The car is getting oil in the antifreeze. Has anyone else had this problem and what was causing the problem?
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Old 10-11-2008, 09:57 PM   #2
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Generally thats a symptom of a blown head gasket
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Old 10-11-2008, 10:00 PM   #3
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YUP YUP

Unless you plan to do the work yourself or its a ridiculously low price for the vehicle id pass.
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Old 10-11-2008, 10:04 PM   #4
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yeah man, run away from it as fast as you can.
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Old 10-11-2008, 10:10 PM   #5
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yeah man, run away from it as fast as you can.
Well that's not really fair, it all depends on his purpose for the vehicle and the price.
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Old 10-11-2008, 10:16 PM   #6
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^^ yeah true
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Old 10-12-2008, 02:40 AM   #7
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Generally thats a symptom of a blown head gasket
blown head gasket would equal alot of white smoke out the exhaust. when i had oil in my coolant the ford dealership told me that the oil cooler was leaking internally. they ordered me a new one under warranty and then they said it was left over oil from the head replacement they did a few weeks prior.
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Old 10-12-2008, 02:56 AM   #8
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blown head gasket would equal alot of white smoke out the exhaust. when i had oil in my coolant the ford dealership told me that the oil cooler was leaking internally. they ordered me a new one under warranty and then they said it was left over oil from the head replacement they did a few weeks prior.
yeah, true. Usually you get milky oil or coolant, and white smoke out the back. But an oil cooler leaking internally totally would make sense. Well whatever it is, I personally would not buy it unless it was dirt cheap. There could be many reasons, I remember replacing 3 heads on a expedition, after a few weeks it would loose coolant. Kept replacing head, but problem came back, ended up being a crack in the block.
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Old 10-12-2008, 06:37 AM   #9
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Since its a 96 GT, your going to want to rebuild the engine to at least PI specs anyway. Lowball the crap out of him and do a engine rebuild or, if you can't afford that, a direct swap from a 99-04 GT.
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Old 10-12-2008, 08:32 AM   #10
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I don't know of any mustangs that come stock with an oil cooler, so that is very unlikely. Even if there was an 'internal' oil cooler leak, that doesn't explain the oil in the coolant since an oil cooler does not and would not have coolant passing through it for any reason. Coolant runs through your radiator, through your thermostat, through your intake manifold crossover, through the engine blocks water passages, through the heating system. The only time oil and coolant have the opportunity to mix is inside the engine, during a blown head gasket, unless you're doing the mixing yourself. I've seen 2 blown head gaskets that neither mixed oil or coolant nor blew white smoke, so those symptoms aren't needed to diagnose a blown head gasket.

I cannot stress enough that an oil cooler will not cause oil/antifreeze to be mixed. Another cause of oil in antifreeze, is doing a head replacement without draining all necessary coolant, and allowing oil due to lack of preparation. And on the side, during the winter/short drives you can attain a milky substance on your oil cap that appears to be the cause of a head gasket being blown, in this case its most likely not.
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Old 10-12-2008, 09:22 AM   #11
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I don't know of any mustangs that come stock with an oil cooler, so that is very unlikely. Even if there was an 'internal' oil cooler leak, that doesn't explain the oil in the coolant since an oil cooler does not and would not have coolant passing through it for any reason. Coolant runs through your radiator, through your thermostat, through your intake manifold crossover, through the engine blocks water passages, through the heating system. The only time oil and coolant have the opportunity to mix is inside the engine, during a blown head gasket, unless you're doing the mixing yourself. I've seen 2 blown head gaskets that neither mixed oil or coolant nor blew white smoke, so those symptoms aren't needed to diagnose a blown head gasket.

I cannot stress enough that an oil cooler will not cause oil/antifreeze to be mixed. Another cause of oil in antifreeze, is doing a head replacement without draining all necessary coolant, and allowing oil due to lack of preparation. And on the side, during the winter/short drives you can attain a milky substance on your oil cap that appears to be the cause of a head gasket being blown, in this case its most likely not.

I believe you are confining your definition of oil cooler to oil-->air coolers, in fact our cars do have an "internal" (integrated would be more correct) oil cooler, it is incorporated into the oil filter adapter (see below).

The filter adapter casting also provides the nipple for the lower radiator hose, something done intentionally to provide for transfer of heat from the oil to the engine coolant. As described in the shop manual it is an integral part of engine cooling.

A flaw in this casting, in its machining, or failure of its mounting gasket would cause oil to get into the coolant in the absence of a blown head gasket. Engine oil pressure is always higher then coolant pressure, and is at it's highest just before the oil filter.

Another opportunity for "oil" to get into the coolant would be the transmission cooler in an automatic tranny vehicle. Though transmission fluid intrusion is very different in small and appearance from engine oil.
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File Type: jpg OilFiltAdap001.jpg (13.5 KB, 9 views)
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Old 10-12-2008, 02:16 PM   #12
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^^+1, I have changed many oil coolers that leak and go bad. coolant runs through and cools the oil.
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Old 10-12-2008, 06:24 PM   #13
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I went and looked a the car today. There is no antifreeze getting in the oil but there is oil in the antifreeze. Me and my dad thought it may have been an possibility oil cooler or a head gasket causing the problem before we went. He looked underneath the car and he did not a see the oil cooler. Does a 96 have a oil cooler? The motor in it sounds really good and does not smoke.
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Old 10-12-2008, 06:35 PM   #14
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^^ well buddy, why dont you tell them its too risky to buy since most likely it has a bad head gasket. That way you can get it dirt cheap. And if it ends up not being major, then you get a heck of deal. Also do a compression test.
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Old 10-12-2008, 06:40 PM   #15
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Does anyone know if a 96 GT has an oil cooler?
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Old 10-12-2008, 06:46 PM   #16
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I went and looked a the car today. There is no antifreeze getting in the oil but there is oil in the antifreeze. Me and my dad thought it may have been an possibility oil cooler or a head gasket causing the problem before we went. He looked underneath the car and he did not a see the oil cooler. Does a 96 have a oil cooler? The motor in it sounds really good and does not smoke.

Read my previous post.

There is an oil cooler, it is part of the oil filter adapter, and on a 12 year old car it could be a failure of the casting, erosion because no one ever changed the coolant, or a bad gasket that is allowing oil to get into the coolant.

Once again it sounds as though you are looking for a classic mini oil-to-air radiator style oil cooler. Stop looking, it isn't there. What is there looks like the diagram I attached.

Also, if it is an automatic there is the possibility that transmission fluid is getting into the coolant through the tranny cooling tube in the outlet end of the radiator.

If the motor truly "sounds good and does not smoke" (under load, not just idling) then it is not a head gasket problem, The only other places where oil and coolant are close enough to intrude are at the oil filter adapter and if a slushbox at the tranny cooling tube in the radiator.
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Old 10-12-2008, 06:53 PM   #17
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Read my previous post.

There is an oil cooler, it is part of the oil filter adapter, and on a 12 year old car it could be a failure of the casting, erosion because no one ever changed the coolant, or a bad gasket that is allowing oil to get into the coolant.

Once again it sounds as though you are looking for a classic mini oil-to-air radiator style oil cooler. Stop looking, it isn't there. What is there looks like the diagram I attached.

Also, if it is an automatic there is the possibility that transmission fluid is getting into the coolant through the tranny cooling tube in the outlet end of the radiator.

If the motor truly "sounds good and does not smoke" (under load, not just idling) then it is not a head gasket problem, The only other places where oil and coolant are close enough to intrude are at the oil filter adapter and if a slushbox at the tranny cooling tube in the radiator.
I saw your previous post but i did not know what years the diagram covered. My dad tryed looking underneath the car but he did not see one but it was kinda hard to look without having it jacked up. I know what type of oil cooler you are talking about. But I'm feeling better about the car now since you seem to think it may a oil cooler problem instead of a head gasket.

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Old 10-12-2008, 06:55 PM   #18
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Does anyone know if a 96 GT has an oil cooler?

For God's sake, yes it does. It is "water" cooled, integral with the oil filter adapter.

This is a wonderful place to do this because the oil has just exited the oil pump and as such is probably at it's highest average temperature anywhere in the system; and the coolant is at its lowest temperature having just been pumped from the radiator.

This means that the temperature differential between the oil and coolant is at it's peak, and that there does not need to be a whole bunch of thermal "connectivity" between the two systems to move a significant amount of heat.

This is also why nearly every modern, hot running engine pumping the ****-thin crap they want to call engine oil these days, has a similar oil cooler built in to the oil filter base.
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Old 10-12-2008, 07:02 PM   #19
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I saw your previous post but i did not know what years the diagram covered. My tryed looking underneath the car but he did not see one but it was kinda hard to look without having it jacked up. I know what type of oil cooler you are talking about. But I'm feeling better about the car now since you seem to think it may a oil cooler problem instead of a head gasket.
If it is has a 4.6L modular V8, and an oil filter screwed in to a casting that also has a fairly good sized coolant hose from the lower radiator connected to it, then it has an oil cooler...
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Old 10-12-2008, 07:11 PM   #20
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its fairly easy to tell. You look under the car, where the oil filter screws is, if there is two hoses attached to right above the filter, that means it has a oil cooler. And like they said, if its an auto then it could be trans cooler causing this problem.
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Old 10-12-2008, 07:11 PM
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