Question about 1993 Ford Mustang

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Have oil in my radiator fluid reservoir tank (1996 v6 3.8)

Oil in my radiator fluid reservoir tank

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  • Chuck Martin
    Chuck Martin May 11, 2010

    do you have an oil cooler on this vehicle? Look at the oil filter housing and see if you have 2 cooler lines running to it. If you do then this is what is causing it. If not then most likely a blown head gasket, a cracked cylinder head or possibly a leak in the intake manifold.

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Twice in two years now my Saab 9-5 has had a pin-hole in the oil cooler, which has caused oil to flow into the reservoir. A way to tell is if coolant/oil is coming out of the reservoir cap. The reservoir cap is rated for the pressure of the coolant system, which is significantly lower than the oil pressure. When there is a hole in the oil cooler, oil will be forced out at relatively high pressures, causing the reservoir to fill and then over pressurize and spill out of the cap.

Posted on May 19, 2009

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Ford gold can start turning brown within a few thousand miles. Check the coolant with manufacture suggested strips to see if coolant is contaminated.

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Blown head gasket.

Posted on Mar 10, 2009

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Blown head gasket.

Posted on Mar 11, 2009

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If your oil and coolant mix it means your head gasket is blown. If it is just an orange or beige paste that you are seeing in the coolant reservoir or radiator thats not oil.

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So think of the reservoir on your vehicle an extension of the side tank of your radiator.

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Relax, there is no problem.

When the water / coolant gets hot (inside of radiator/engine) it starts to boil, ofcourse when it boils, it expands, so the fluid in the radiator has to go somewhere, thats why there is the overflow reservoir. So, when the fluid boils, some moves to the reservoir to avoid any potential problems with the radiator, such as it blowing up, or not being able to cool off all of the fluid running through the engine.

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someone has just reversed the valve covers swapped them from one to the other as far as the oil concern, sounds like you either have a leaking trans cooler in radiator or you have a blown head gasket

Mar 10, 2009 | 1993 Ford Mustang

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