That 7.3 IDI motor has what is called a CDR valve. It is the tuna can looking thing that is probably mounted to the driver side valve cover with a hose running to the intake since you have a turbo added. This is to get rid of crankcase pressure, but when it goes bad it allows oil vapor to be continuously sucked into the motor.
My 6.9 IDI (basically the same motor) was eating oil, I bought a new CDR from the dealer for like 85 bucks and now I go 3k miles and burn maybe 1/2 a quart.
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