Intermittent White Smoke After Cruising/engine Braking

[arrydjay]

So I have noticed now on two occasions after cruising my car off boost for a while or after driving down a mountain using engine braking my car starts to blow some white smoke... if I pull over and let it idle it seems like a fair amount of smoke. As soon as I give it a good hiding the problem goes away...

Any ideas? it's weird because it wasn't doing this before.

[DVS JEZ]

Seems like valve stem seals