Is silicone oil good for lubricating your rod? What’s your preferred lubricant?
I usually just use hand lotion when I lubricate my rod. 
I use sewing machine oil for my ulitimaker original
I use gun oil on my prusa i3
I like silicone, but it dries off very fast.
Sewing machine was creating gunk after some months of application.
Today i use WD and it seams to be working better.
@Andre_Frazatto i read in reprap forum that wd is a big no no for precision stuff , it actually grind your metal
@Kevin_Danger_Powers ewe! Dats naaaaaasty 
WD-40 is a terrible lubricant, it’s designed to penetrate and displace water from surfaces, and then evaporate off over time. Pretty good cleaner, but not good for bearings.
As for what you should use… depends on the bearing type. LM ball bearings, you should be using grease. Sintered bronze, sewing machine oil or motor oil is good. Plastic jugs bushings, run dry.
PTFE grease. it is ideal for high mechanical load and dirty environments, just a few dabs on a threaded rod and run the carriage up and down it to spread it
For the rods in my U-joints on my delta, I use sewing machine oil aka multi-purpose oil.
@Greg_son I will keep a close look to confirm it.
But as my printer has stainless steel rods, shouldn’t be a problem.
I was thinking about trying Vaseline, for a more long term coating.
Anyone tried it?
Vaseline is great. Don’t use WD40 on ball bearings, it just dissolves the grease and dries in weeks.
I use lithium grease.