@agecoo White exhaust smoke from your car, depending on when you see it, can be extremely serious or it can mean almost nothing. If you only see it when you first start the car in the early morning when the temperature is low, you have nothing to worry about. However, if you see it all the time, you can have a simple problem, or a very serious problem. If the smoke dissipates shortly after leaving the tailpipe, this means it's actually steam and signifies a blown head gasket. This is bad. If the cloud isn't too bad and doesn't dissipate, then you could be burning oil. Depending where the leak is, this can be very bad or not terribly bad. No matter what, you should have it looked at.