Skip the auto shop - Our mechanics make house calls

Q: Smoke coming out of exhaust

asked by on

I have a blueish gray smoke coming out of the exhaust and I detect the odor of either gas or burning oil.

A: Hi, the blue tint you mentioned is in fact ...

Hi, the blue tint you mentioned is in fact from oil burning. Over time the internal engine components, specifically the piston o-rings and the valves, wear out and oil starts seeping into the cylinders and burning with the air and fuel. A technician can diagnose the source of the smoke by testing these internal components to make sure they are sealing properly. Be sure to check your oil level frequently until this is resolved as more damage could occur as a result.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Strong gas smell when car is sitting

Hi, thanks for writing in. The strong gas smell may be an indication of a fuel leak from a fuel line somewhere or potentially an evaporative emissions system leak. Check to see if you see any visible signs of fuel...

Q: Low idle, lots of smoke from the exhaust, feels like no power. Mechanic looked at it and said to change my oil grade?

Hi there. From the description you have provided, there is a combination of things happening with your vehicle. If the exhaust smoke is oil smoke, increasing the oil viscosity could help reduce the oil consumption. It could be, the piston...

Q: Check Engine Light is on. P0430 code.

The Check Engine Light on for code P0430 is for the right (passenger side) O2 sensor indicating a bad catalyst on the passenger side or right side of the vehicle. Before replacing the catalyst, check all the engine ground connections...

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...
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...