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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Oily thick coolant

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 overheating - 2006 Chrysler 300

Hello. The cooling fans should come on before the engine gets too hot and overheats. The ECM should be scanned to see if it is signaling to turn on the cooling fan at the correct temperature and if the totally...

Q: I got a 05 pacifica and the head gaskets were bad so I changed them. I put it back together and changed oil and now it won't start.

Hi there. The codes are coming up for the Oxygen Sensor, Oil Pressure Sensor, Evaporative Emission System Vent Valve, and the Air Conditioning Clutch Relay. Since all of these conditions are separate circuits and in different locations, I suspect that...

Q: Runs rough, replaced crankshaft position speed sensor

Hello, The crankshaft position circuit is the electrical circuit for the crankshaft position sensor. If the sensor has been replaced, then it may be possible that the wiring or connector that goes to the sensor is having an issue. If...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...