Diesel engines operate more efficiently than gasoline-powered ones, and they're crucial to the U.S. economy. But does this ...

gray exhaust fumes could indicate a variety of problems. Unlike the straight signals from white, blue, or black smoke, gray smoke is the wildcard that could hint at a few issues under your car's ...

Your exhaust system is essential for fuel economy and the safety of your car, especially in winter. Speedy can help maintain your exhaust system ...

During normal operation, the emissions from a car's tailpipe should be invisible ... If your engine is burning enough oil to produce visible exhaust smoke, the oil level will drop over time ...