Question of the Day: Is White Smoke From a Tailpipe OK?

You see it spilling from the tailpipe while sitting in traffic or waiting for a light: white exhaust that lingers in the air long enough to make you uncomfortable. Has something gone wrong in the guts of your car? Or is this just a trick of the weather? Ask.cars.com tells you when white exhaust is to be expected and when it might mean you have a problem.

Is white smoke from a tailpipe OK? (Ask.cars.com)