I was looking at rebuild kits for T3's on ebay when I noted they had 2 large gaskets.
I am almost sure they would go to the compressor housing and the turbine housing to seal them against the center seciton.

I do not have these on my turbo. I got the turbo in trade from a friend that was in debt to me. He'd taken apart the turbo to polish the compressor housing, but stopped trying after sanding with 60 grit.

Anyway, could this be the cause of my exhaust oiling turbo?

2005 Ford F150 SuperCab FX4 1964 Chevrolet Impala SS 1998 CSVT: 354HP/328TQ @ 10 psi, now gone