My DBB aftermarket turbo currently has a .030" restrictor on the oil supply line, but I want to try a .020" to try to reduce oil leaking and burning. If I can't reduce consumption, than I will be putting the stock turbo back. My fear is that the turbo will go bad and damage other parts of the engine.
Here is the back story. I don't want to bash any manufacturer, so I have left their name out. 14 months ago I upgraded a ton of stuff including my turbo. I smelled burning oil the moment I started it when I picked it up. I assumed some spilled on install, but when I got home I saw smoke coming out of the exhaust at idle. I always smelled oil, and I saw smoke often. I drove that way for 10 months, and 6000 miles. The consumption was consistent at about 1 quart every 800-1000 miles. When I did my second oil change I noticed oil leaking out of the turbo. I pulled it and sent it in to the manufacturer who repaired it under warrantee. I reinstalled it and no smoke for about 25 miles, then it started smoking again, and leaking oil. The consumption is as bad or worse than before. I am not going to take it out and put it back in again. I would just keep adding oil, but it already fouled my upstream O2 sensor once.

 

Sounds like it's an FP turbo? Have you addressed any potential crank case ventilation issues?

 

I am running only slightly larger than stock turbo with all of the original oil lines. I have the stock PCV valve. I did replace it. Even if I turn the boost down to 20psi, and or don't drive in boost it still leaks and burns. If having an aftermarket turbo means I have to redo the oiling system, than I'd rather go back to stock.

 

Added a catch can. No more oil burning