Since fitting my decat down pipe and full stainless steel exhaust I have notice that on idle after a minute or so I get white smoke that smells of oil,coming from my exhaust ,only when up to temp and only on idle ,

I have looked into this

And it seems as though my turbo has blown a seal due to lack of back pressure ,I will be double checking this or my turbo is just dieing

I'm confused as this seems common on turbo cars with decatt could this be and O2 sensor ?? I don't know

It's not loosing water or oil and no mayo lol I was wondering if it could be the pcv valve ?

Oh and car drives fine ???

if it was a turbo seal its blue and only happens once you have booted it and the rpms are dropping, Pure white is usually condensation in your exhaust, will be the Downpipe coking up, usually they also have a special coating to stop the rusting this also burns pure white for the first couple hundred miles as well.