Turbo ques??

[thegosson]

Is it just at idle or low revs, or most of the time??

White smoke generally means water/coolant leak, i.e headgasket!

I'd do a compression test on all cylinders and see if any are down on pressure a wee bit!

If you think its the turbo oil seals then the smoke should be blue or greyish in colour..

what jay says here would be what id say too.