Fan shaft lubrication - 18" fan

[dgray64]

I have an 18" fan on a stand that is about a year old.  The front (fan blade end) bushing (no bearings) has lost its original lube.  Now the shaft regularly freezes up after turning the fan off.  I have to remove the cage, and blade and drip some 3in1 or other light appliance oil down the shaft to free up the shaft then re-assemble. 

This fix lasts about a week sometimes less according to its use. 

My questions are:  What was the original lube?  Is there a particular oil that will last longer in the bushing than those two that I am using?  Any suggestions?  I hate to throw it out as it is quiet and effective here in central Texas.  I would just like the lube to last more than a week.  Thanks

Dave           (you could say Cheap Dave, or Dave who hates to waste beer money on a new cheap fan)       

[appl.tech.29501]

a light turbine oil will work but maybe not any better....can you post a brand name and a model # of the fan...maybe able to get new bushings from manufacturer.