Everybody seems to agree with the pre-break in of Drill Collar and Tool Joint threads.
As this must be done in a vertical position, not all suppliers and Service Companies have facilities to do that (derrick and/or well. Because of that, some Drilling Contractors are forced to do it on the rig, which is very time consuming.
The initial make up should be
made with generous lubrication and the threads walked in with due care. See
IADC/SPE 19961 paper above. This to remove eventual wrinkles on forged/rolled threads.
I hope that helps
For my part: