Question

What kind of issue is indicated by blue gray smoke?

1) Engine misfire
2) Oil leak
3) Fuel injection problem
4) Exhaust system failure

Answer 1

Blue or gray smoke from a car indicates an oil leak, where oil burns in the combustion chamber due to issues like worn valve guides or piston rings. (option 2)

Step-by-step explanation:

The presence of blue or gray smoke coming from a car's exhaust typically indicates an oil leak. This kind of smoke is a sign that oil is burning within the engine's combustion chamber. When oil seeps past worn valve guides, piston rings, or within turbochargers, it gets mixed with fuel, gets burnt, and produces blue-gray exhaust smoke.

This is different from the white smoke that might indicate a coolant leak or black smoke that suggests a fuel combustion problem. Therefore, when you see blue-gray smoke, it most commonly points to an oil leak rather than an engine misfire, fuel injection problem, or exhaust system failure.

Hence, the answer is option 2