Standard machine fat would do the job. Just keep in mind to get fat instead of oil. Oil is made for enclosed applications, fat is for bearings etc. that are exposed to the outside. You should find such lubricant in your local hardware store. -Marius
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You can use bicycle oil. That works fine. Don’t use lithium grease because it’s really messy.
When in doubt the RepRap Wiki is a great reference. No matter what 3D printer you’re using, its roots can be traced to RepRap. Here’s the wiki entry on lubrication: Lubrication - RepRap 7.3k Good luck.
I would wipe off any oil on the rods since it might tend to collect dust which would be worse than nothing.
You can go to a local machine shop and request some “Side way Lube” is a high viscosity lube used on the bead of the mills. As previously comment the bearing are self-lubricant. Most important is to keep cover you printer when not in used, due dust in the room. See attached image, clean this accumulated dust with a cloth with some 3-1 oil but only clean the end of the shaft.
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I use tamiya ceramic grease and works fine i also put some on the belts its for plastic and metal.