I have 2 t3 t4 turbo on my 8.1.One of the turbos is leaking oil between the exhaust and the cartridge.The turbo has new fire ring ,thrush bearing,dynamic seal and seal collar,backing plate,bearingin the housing.I done all of this and it still leaks oil.So I restricted the oil feed to a .045 and took off the oil cap to see if it was crank pressure but still it leaks oil!!!!!! I'm almost to the point of taking them back off can anyone help or has anyone seen this before?

 

Where are the turbos located? And how are you returning the oil

 

The turbo are were the air box was and I am gravity return to the oil pan.