2001 7.3 Using/burning oil - 1 quart every 100 miles

[Cowboy DMD]

2001 7.3 with 130,000 miles started using 1 quart of oil every 100 miles. No visible leaks - not a drop on driveway. No loss of power, good compression. Exhaust smells like burning oil and has blue tinge. Recently replaced turbo with no change in oil use. How is oil getting into the cylinders? Injector o-rings? If so, how do I test for that? My fuel bowl looks clean and clear. No or little blow-by out oil fill. Is there anywhere else oil is getting into the cylinders?
Thanks for help!

[mgassel]

Injector o rings are failing there is no test for that just replace all of the o rings it is only about 10 bucks per injector for each set of orings.
If your oil is clean ie not black you will not see a dark color in the fuel bowl or it may not be returning to the fuel bowl.

[1snakedoc]

blue in the tail pipe the oil is burning. 2 places it can get in turbo and injectors.
it can go into the fuel but it think it can go in the cylinder and show no sign.