If you’re talking about the different colors of smoke coming from vehicles, take note of the fact that gasoline vehicles emit four different colors of smoke for various mechanical reasons. Blue Smoke may be a sign of engine oil being burned, caused by an oil leak into the combustion chamber or worn piston rings, valves or cylinders. Black or Grey Smoke may be a sign of incomplete fuel combustion caused by a clogged air filter; carburetor, choke, fuel injection or emission system malfunction; ignition timing off; or a blocked manifold. White smoke can signal a gasket leak.
As for diesel vehicles, blue smoke may be a sign of high engine oil levels or worn piston rings, valves or cylinders. Black or Grey Smoke results from incomplete fuel combustion. Finally, white smoke indicates that fuel is not burning correctly.
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