New
#31
Even though the new fan was a lot quieter than the old, it still made a very low buzzing sound for the first day of operation. The ad that I bought them from didn't specify, but I'm assuming that they are sleeved, rather than ball bearing. Even though you said that they shouldn't be lubed until needed, I'm thinking that the noise it made indicated that it could use some additional lube....what do you think?
You mentioned using a pen lube, but didn't say which. Is there one that is better than others?