Brushed Motor BREAK-IN Tip:
For Breaking in a Brushed Motor, Best method is run the motor on low voltage less than 3 volts.
Start with a drop or two of oil on each bushing or bearing and a drop or two of comm drops on each brush. About half way through the break in add another drop or two of comm drops.
For a sealed can motor like a Tamiya Mabuchi Motor I would run it for at least 1 hour.
For a Rebuildable Brushed Motor with stock or upgraded brushes run the motor for about 30 minutes
If you have a motor mount to hold the motor add a small fan to motor shaft to blow air through the motor to keep it cool.
When finished clean motor with electric motor spray and re-oil the bearings or bushings
Adding one drop of comm drops before a run will add a little performance, but brushes will wear quicker.