Skip the auto shop - Our mechanics make house calls

Q: Oily thick coolant

asked by on

The coolant is very thick and oily , I want to say that the transmission cooler can be the issue ?

My car has 200000 miles.
My car has an automatic transmission.

Hi there. This is a sure sign of a blown head gasket. This can happen when the car overheats causing the cylinder head gasket to fail. When this happens, this will allow oil to leak into the engine coolant passages as well as water to leak into the engine combustion chamber. You may also notice the exhaust smoking white as well as white smoke coming from under the hood when this happens. This can and eventually will (if not taken care of soon) cause major engine damage and ultimately the engine will fail due to loss of cylinder compression and many other related issues. I recommend having a certified professional, like one from YourMechanic, diagnose the overheating problem and proceed with the proper repairs.

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car is running hot but I put coolant in it

If you are full of coolant but are overheating then you either have a broken cooling fan or a thermostat that is stuck closed. If the fans are coming on then the most common failure will be the thermostat. ...

Q: Battery ground wire issue

From the description provided for your Chrysler Pacifica, I believe that it needs a new ground wire on the battery. Corrosion on power or ground wires can reek havoc on any electrical system. Corrosion creates resistance and the result is...

Q: Problems removing Dodge Ram rear differential

The instructions for removing the rear differential assembly for your truck as follows: * Position the vehicle on a hoist (or jack stands) * Position a support under the axle assembly * Remove all the brake components * Remove the...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.