Question about exhaust fumes

[RBSilvy85]

I've noticed that whwn my truck is sitting and idling that it exausts white fumes from the tailpipe. Now I have become used to that when it's colder out, but today it is 75 degrees and it was still doing it. Is this normal or am I burnig oil?

[fondupot]

Was the truck sitting for a while before? Could have just been condensation boiling off in the motor/exhaust pipe. Did it go away after a little while?

[RBSilvy85]

It had maybe been sitting 3 hours

[RBSilvy85]

Do I have something to worry about?

[newdude]

Normal condensation.

[pm26]

An oil burner will typically belch white smoke at all times, even when fully warned up. Also, high mileage vehicles occasionally emit a puff of while smoke after initial startup because the oil control rings on pistons are worn and some oil seeps into the combustion chamber. You should not see anything like this with a new engine.

[SurFire]

White "smoke", which is actually steam, is indicative of moisture such as condensation build up if it happens when first starting engine, or coolant when it is constant and in greater quantities. Burning oil presents as blue smoke.

[Gabe63]

The old rule of thumb is that for every 1 gallon of fuel you burn the engine produces 1 gallon of H2O, water. This is part of the chemical reaction of the gas, hydrogen, CO2, and product of combustion. I think that ratio may have changed with new emissions but you will see water come from every cold tail pipe, not sure if this is what you are seeing but it happens.