Remember that excessive diesel smoke –- whether black, white, or blue -– causes poor fuel economy and could lead to expensive repairs when left unchecked. Finally, adhering to your diesel ...

The first bit of smoke coming out of the exhaust will be dark gray, then it’ll become white as the fire progresses, and eventually it will move to the desired blue-smoke stage. This is the smoke ...

Black smoke can ... the combustion chamber. Blue smoke can also be a sign of more serious problems, such as a damaged engine or engine oil being clogged. White smoke right after a car starts ...