exhaust pipe rusting? new car?

[Troy]

i bought my new car 3 days ago and i notice that the exhaust pipe in the back started to look rusted.
why is that?
it was raining one day... and the following morning i turn my car on and there was white smoke coming out.

 

[Jon P]

What you see is condensation. Plain old water that is a by product of combustion and catalytic exhaust plus from the car setting through changes in weather. Short trips cause this too. It will dry after running for a while and the system components should last a long time.

 

[shuman57]

its not going to affect your car unless it rusts through the muffler or other part of the exhaust system.

 

[Robert E]

Most cars have cheap iron exhaust pipes. That leaves them sensitive to rust. However iron pipes can still last rather long because they dries up when they get warm. But this requires that you drive long enough distances to dry up. If you only occasionally drives a few blocks rust can come quickly.

Light white smoke is normal when engine is cold and in humid conditions. This usually disappears when engine gets warm.

Thick white smoke can be a sign that you're getting water in the engine. If for instance the engine block has cracked cooling water can get into the cylinders. That's baaaad! :-( Let's hope that's not your problem.