TSI isn't an oil in the typical sense, it bonds to metal, filling in the microscopic pores and leaves a coating behind that repels dirt and moisture. It'll stay put on reel bearings for a couple of years easy without any reapplication. When using alcohol, the alcohol functions as a carrier and quickly evaporates. It works similar to TSI 301 which contains a solvent that's harmful to plastics. Alcohol isn't going to warp plastic and it's pretty cheap to boot.
Here's my junkyard Abu 4500, the spool bearings are at least 20 years old. They were from an eBay donor 5500 C3. This reel is just a two bearing reel, everything else is polished bushings and treated with the pimp juice concoction above.
https://youtu.be/GQ_ZSFF8row