Steamy exhaust ??

[Pistoner]

I’ve noticed today of this very thing smoke/steam coming from my exhaust?
I’ve been for a 30 minute motorway drive and still this happens?

Anyone have any ideas of what this could be ??
Hopefully you can see the video.
Thanks

[Pistoner]

I might be completely wrong but I thought:

A head gasket would cause a thicker ‘cloud’

Think it’s worth getting it checked ?

[Pistoner]

Haha fortunately not olly.

[Pistoner]

Thank you!

I will check my coolant levels.

I do 25 miles a day so not a huge amount that’s why I chose the petrol engine.

Wouldn’t Mayo on the oil cap be a head gasket ??

[Pistoner]

Thank you all for the replies!

No Mayo on the oil cap and the coolant looks fine.

[Pistoner]

Sorry couldn’t reply yesterday as I was new.

Thank you though!

Just a little update….no smoke this afternoon which is good.

Although there is a little water in the exhaust….normal I’m guessing ?

[Pistoner]

Thank you e-bmw.

Think I’m just paranoid because my last car had a knackered dpf filter. Even though this is a petrol lol

[Pistoner]

Pastie Bloater said:

Nothing to worry about
petrol + oxygen = carbon dioxide + water vapour

🙏 thank you

[Pistoner]

Huff said:

In quite large quantities too - burn one gallon of petrol, you get about two gallons of water from combustion (the extra is the bound oxygen from the air) - delivered as vapour

Given that steam at 100degC is c 1300x the volume of the water that generated it - you soon see why,at idle,on the right kind of cool humid or cold day - you can see gallumphing amounts of water vapour out of the exhaust- that diminishes once the whole exhaust system gets warm enough.

Nothing to worry about. And if the car is new to you, good idea to keep half an eye on coolant and oil levels anyway -over the first 3-6000miles, say,after which you'll get a feel that watershouldnt need attention, and oil, probably not much at all. ATB

Thank you ! It is new to me 2 weeks old ! 2018 Audi A4 saloon.
Short journeys I find it shows more water obviously where the engine isn’t warm enough to clear it. Is this common on both fuel types or just petrol? Never noticed it before on my 2015 diesel.