I doubt deleting the EGR would change UOA in any meaningful way. Keeping the oil cool, not ideling and using good quality oil would do FAR more from my experiences.
EGR actually keeps Combustion Temperatures and Pressures (CT/CP) lower because the fuel burns in a much more controlled fashon with EGR than without. You get a little lower peak CP but you get CP for a longer time. Notice that modern EGR equipped diesels make more power with the same displacement than the older ones could. They are more efficient at making power.
If you want to ruin your oil FAST, increase ICP to get more power! The HPOP is responsible for generating a LOT of heat in the oil and shearing it more quickly than with Common Rail systems. Anyone familiar with hydraulics knows that when you increase system pressures you also increase fluid temp, so increasing ICP actually shortens your oil's life.
One other thing, make SURE the "Clean Power and Ground" connections (B+ and B-) and fuses in your battery box are GOOD. I mean that the female terminals are tight on the males or you could be causing yourself a lot of trouble with low ECM power. One thing to look for is discolored terminals, especially on the fuse holders and if in doubt, go to the dealer and get a new "jumper harness" before you start wasting time troubleshooting "Unexpected reset fault" or "ECM voltage below threashold B+" faults.
