Skip the auto shop - Our mechanics make house calls

Q: What causes oil leak between head and block and whitish blue smoke from exhaust plus milky oil

asked by on

The smoke smells like fuel not oil there is no knocks or ticks

My car has 150000 miles.
My car has an automatic transmission.

This is a common sign of a blown cylinder head gasket. In between the cylinder head and block is a thick gasket that seals off the combustion chamber and maintains separation of the oil and water passages through the cylinder head and block. Although not always, typically when the engine overheats, this gasket will fail causing the motor to lose compression and eventually quit running. As a result of this, the engine will commonly emit a white smoke from the exhaust that is the result of burning oil and water along with the fuel inside the combustion chamber. You may also notice the oil to be a milky color as a result of the water mixing with the oil. In some cases, the oil may also contaminate the coolant system causing traces of oil to be found in the coolant. This is generally a very extensive repair job that will need to be handled by a qualified mechanic. I would recommend having an expert from YourMechanic come to your location to diagnose your situation to determine the best options for your 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

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
  • What causes oil leak between head and block and whitish blue smoke from exhaust plus milky oil

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: Replace the starter but then turn it over still no start and fuse burnt out

Hi there. It's possible that you have a faulty ground wire on your starter or an exposed wire that is causing the fuse to pop. If the battery terminals were not removed before completing this repair, it's quite possible that...

Q: AC

Hello there, I will need a more detailed information of your 2010 Camaro's issue before I can provide an answer to your question. Please provide a more detailed description and submit another question. YourMechanic's qualified Technicians are available to answer...

Q: I have a 93 chevy astro and im not getting spark to from my ignition coil

There is a problem on the primary side of the ignition circuit. If your distributor was not replaced and contains a Hall effect pick-up assembly that can be tested using a self powered “indicator light” that is made for this...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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.
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.