Yea,
let Me know; as I haven't kept track, but is SEEMS longer as the brushes are wearing more evenly. When I get a new motor in; I dissasemble it and pack the bearings with hi torque, hi temp grease. I noticed new motors sometimes have the bearings dry as a bone and sometimes they are factory oiled. Dissasembly isn't for the faint hearted though and I've ruined a couple before I learned the right way to do it. I then use very very fine sandpaper and smooth and polish the commutator.
I don't know why I go through all that, but I like doing . . . stuff.
Thanks.
Gary