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Old 10-05-2004, 10:42 AM   #1
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Oil in Antifreeze?

Here's my probelm. Saturday I dumped the antifreeze in my 85 GT,5-spd. and refilled it with water. My local drag strip requires no antifreeze to test and tune. Sunday I make 6 passes and call it a day. I get home I drain the water and refill the radiator with the antifreeze that I previously had drained. (The pan was cleaned before the antifreeze was drained into it). The motor was cold when I refilled the radiator. I start the motor to warm it up so the thermostat will open. When the motor warmed up I noticed what seemed like oil floating in the antifreeze. Could this be anything other then a blown head gasket? Could this be anything other then oil? Does oil float on top of antifreeze or does it foam? The car runs fine. Oil preassure is 55 psi.,(normal) and the water temp is steady at 185 degrees (also normal). Any opinions are welcome.
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Last edited by Fishhawk; 10-05-2004 at 11:02 AM.
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Old 10-05-2004, 11:31 AM   #2
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Quote:
Originally Posted by Fishhawk
Here's my probelm. Saturday I dumped the antifreeze in my 85 GT,5-spd. and refilled it with water. My local drag strip requires no antifreeze to test and tune. Sunday I make 6 passes and call it a day. I get home I drain the water and refill the radiator with the antifreeze that I previously had drained. (The pan was cleaned before the antifreeze was drained into it). The motor was cold when I refilled the radiator. I start the motor to warm it up so the thermostat will open. When the motor warmed up I noticed what seemed like oil floating in the antifreeze. Could this be anything other then a blown head gasket? Could this be anything other then oil? Does oil float on top of antifreeze or does it foam? The car runs fine. Oil preassure is 55 psi.,(normal) and the water temp is steady at 185 degrees (also normal). Any opinions are welcome.

I've had oil float on top of the antifreeze in my radiator before. Other than a head gasket, maybe your lower intake/head is not sealed? But, my guess would be the head gasket.

Dan
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Old 10-05-2004, 12:11 PM   #3
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No lower intake. Carb. car.
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Old 10-05-2004, 12:20 PM   #4
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Quote:
Originally Posted by Fishhawk
No lower intake. Carb. car.


You still have an intake thats low on the car.
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Old 10-05-2004, 12:41 PM   #5
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It's hard to say if its actually oil or if its scale from your cooling system. Could be just scale deposits from your radiator. I would run the car at normal operating temperatures than add a bottle of cooling system flush in the radiator and drive around for like half an hour. Come back home and drain the coolant than fill it back up with plain water, drive around some more, drain, refill, drain, than replace T-Stat and add new pre-mixed coolant with a bottle of coolant additive. When you drain the old coolant, look to see if it has anything in it like oil or scale. If its scale its normal, oil means you need a new upper engine gaskets, intake and head gaskets.
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Old 10-05-2004, 01:14 PM   #6
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I was also thinking something along the line of scale deposits. the radiator has been drained and refilled 5 or 6 times this summer, but I have never run just plain water in it before. I'm hoping something just worked its way lose.
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