Most lubes for that job are either too heavy and wax / cake over the time a post cable is in or migrate. Try a polished Jagwire - slick, and no coating to flake off.
170mm dropper post recommendations?
Joined: April 25, 2003
Triflow has always treated my cables well.
When installing new housing I don’t add any as most modern housing is pre-lubed.
I add Triflow whenever I have to service the cable or it gets sticky.