Skip the auto shop - Our mechanics make house calls

Q: it over heat and now wont start and the engine oil looks like milkshake

asked by on

my car over heated 2 weeks ago and now it wont start it cranks but nothing happens my engine oil looks milky i need help any idea on what can it be??

Milky or milkshake-looking engine oil indicates the engine oil and engine coolant have mixed together. This can happen after a severe overheating of the engine. This mixing can happen from either the head gasket cracking, or the cylinder head itself cracking.If a crack or break in either happen between a coolant and oil passage, then the oil and coolant will mix. Also, cylinder compression can be effected if the overheat was severe enough to crack the head, or not only crack the gasket between oil and coolant passages, but around a cylinder bore as well. Lack of compression can be the reason for the crank but no start condition. The cylinder head should be removed and sent to a machine shop for inspection before further repairs are attempted. Generally, a cracked cylinder head is non-repairable and has to be replaced.

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!
  • Home
  • Questions
  • it over heat and now wont start and the engine oil looks like milkshake

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: What are the symptoms of VSA light on in 2009 Honda Accord EXL 2.4 liter?

Hi There, The VSA light indicates that something may be wrong with your Vehicle Stability Assist (VSA) system, otherwise known as your traction control system. The traction control system uses wheel speed sensors at each of the wheels, which monitor...

Q: 1999 Toyota Celica, starts and "moves" fine (engages) but slow starting, like driving thru quicksand. No other problems but check

Hi There, Generally, the check engine light comes on when something fairly serious is going on with the vehicle. This can happen for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad...

Q: Should I start my car, what do I do next?

Hello there. Quite often when you experience a flooding issue like you have described, it will damage electrical components within the ignition system. The best solution is to have a professional mobile mechanic come to your location to complete a...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.