Oillite bushings

Hi guys,
Have a powered beater bar (dyson DC35) on a battery operated vac with 'greaseless' oillite bronze bushings at the end - Typically in other machine applications with oillites I would add a small bit of grease to it and it seems to keep tolerances in check.
A small amount of scoring is present on the shaft. I suspect the dusty environment has wicked the oil out?
The beater bar bushing is pressed in and I'd prefer not to remove them and re-oil them using the typical method of heating the bearing to 80c and submerging in oil.
as this is in a dusty environment I'm not sure anymore.
Just wondering how you professionals tackle this issue.

Wanted to see if anyone else has experienced the vibration problem from the driver side front axle. I've seen the needle bearing replaced with an oillite bushing to take up the slop in the carrier. Really just asking if its necessary to do or if it's just for those who are irritaded by the vibration?