Skip the auto shop - Our mechanics make house calls

Q: Oil in the coolant tank

asked by on

I own a 2003 Jeep Cherokee 2.5 CRD. It started rising in temperature to the halfway mark where it never reached normal conditions, followed by a warning buzz or chime and the oil light coming on and off twice. I then pulled over and switched off the car. I opened the hood and noticed that there was black milky oil in the coolant tank and some smeared on top of the exhaust manifold. When I opened the oil filler cap and noticed some slight milky residue, I then got someone to tow it home. Please help me with some technical advise what can this be?

My car has 71457 miles.
My car has a manual transmission.

A: Hi, thanks for writing in. If you have cool...

Hi, thanks for writing in. If you have coolant in the engine oil showing on the oil cap, then you likely have a blown head gasket. The oil in the coolant is most likely from the blown head gasket getting compression into the coolant overheating the engine. I recommend having the vehicle checked by a mechanic to see if engine is repairable by replacing the head gasket and flushing the coolant and engine out. Here at YourMechanic, we can have a technician come to your home or office to inspect and diagnose this issue for you, and make or suggest the necessary repairs. Hope this helps and best of luck!

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Electrical power drops out completely while driving.

A faulted automatic shutdown relay or asd relay is a common concern on your vehicle model and can show the same symptoms. I have seen this problem caused by the relay as well as corrosion inside the under hood fuse...

Q: Cooling system leaking

Hi, depending on the size of the leak and where it is coming from the BlueDevil head gasket sealer may be enough to stop the leak. However, if the leak is fairly large and is from the head gasket, I...

Q: Can grease viscosity lead to engine failure?

Assuming you are referring to the engine motor oil, this is not likely something that would cause an engine to fail instantly. As you may know, the motor oil is what lubricates all of the moving parts inside your engine....

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...