Quote Originally Posted by Justin_Inc View Post
Do not restrict the turbo feed line unless its a ball bearing turbo, a -3 to -4 oil feed is perfect. You'll kill a journal bearing turbo with a restrictor in there. I would say that the drain is causing the issue IMO, I cant see it being a valve seal (it wont generally smoke ALOT i if it is one, mainly on startup). The oil drain must be a -10 (-12 preferred) and run a constant downhill slope from the turbo with as little restrictions as possible. I'm sure you know this all already but just stating it for the heck of it

He has a ball bearing turbo and 5/8'' drain line