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Old 11-13-2012, 08:02 AM
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Question Oil In Radiator/Overflow

Hey I have a 89 Mazda 626, Auto Tran, 2.2L-No Turbo. I bought this car and discovered oil in radiator...I assumed it was head gasket so I changed gasket, pressure tested head and put it back together ... even though I never had any water/coolant in oil, good compression and car actually ran quite well. So now I have a great running car, with new head gasket with oil in coolant. Big note here...the car runs good, temperature is steady, and there is NO coolant in oil...also the first time I discovered this was two days after completing repairs...the oil in overflow is NOT mixed or frothy...almost clean oil is coming out of the radiator overflow. I can hear the upper hose drawing fluid back to radiator and I think it is sucking oil back with the coolant as it cools. Any help here would be greatly appreciated.
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Old 11-13-2012, 08:08 AM
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Normally with automatic transmissions, the bottom part of the rad is used to cool transmission fluid. Maybe the barrier in your rad has disintegrated to where the 2 are mixing. You may be getting coolant in your transmission. Please check your transmission fluid. Your car is very old and a new rad may be required as well as tranny fluid!.

Last edited by UseYourNoggin; 11-13-2012 at 08:15 AM. Reason: tranny fluid
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Old 11-13-2012, 04:04 PM
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Tranny fluid is fine...and there is no tranny cooler on radiator...car is older for sure, but only has 111,000 miles. Radiator looks new.
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Old 11-13-2012, 05:39 PM
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So where else come oil galleys and coolant close together? In many cars it is the lower intake manifold gasket.
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Old 11-14-2012, 07:46 AM
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Default Better gasket anyone ?

I was thinking about that, new gasket, but I think you are correct...the felpro gasket I put on looked like a piece of grey construction paper...I am going to pull intake manifold - anyone have a better way to make sure this thing seals, better gasket or some goopy crap ? I would love a great idea here.
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Old 11-14-2012, 08:02 AM
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I just noticed you had head pressure tested, but does that test also check for warpage?
A warped head would not seal properly.
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Old 11-14-2012, 10:49 AM
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I have a 96 3.1 chevy that had issue with anti-freezr in oil. Replaced lower intake gasket ect. I used felpro gasket. This gasket looked like it had red rtv in the lower section. This was a few years back, no problems since, BTW that gasket set was $40. If you suspect head gasket isn't sealing or warped head, take the head to a machine shop. They can put it on a surface plate to check for flatness. Might be a good idea to check it for cracks also.
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