I just put a new turbo on my car about 7 weeks ago, ever since, I have big puffs of dirty coloured smoke only on boost, it's not specifically white or blue or black, but a dirty grey colour, almost looks like the car is running heaps rich (that type of smoke). How it works is the first time I boost it after start up, there's quite a bit of smoke, but then as I drive it and every boost hit there after the smoke becomes less and less, sometimes to the point of blowing no smoke, I think it's the oil feed nipple, I had to get a new one and its opening is 6mm diameter, compared to my old one was only 1.5mm, and the oil drain is a little more horizontal than before, maybe getting oil backed up in drain, or maybe s**t turbo,? From what I understand oil blowing through the seals doesn't necessarily mean blown seals, someone got any suggestions?

Valve stem seals . Or opening up the feed is putting to much oil thru ya turbo and blowing it out the seals . Try putting the restrictor back in it

if its a ball bearing turbo put the restrictor back in, if its std bearing turbo its ok without restrictor...

otherwise the smoke could be engine related..

if it was valve stem seals wouldnt it smoke up regardless of whether im boosting or just cruising or even at idle..?