For pumping, I lube the entrance with KY jelly and lube my dick with water based astrogide. I dip the KY lubed tube in water, which “activates” the KY and gives me a perfect seal.
All of the pump manufacturers say avoid oil based lubes as that will damage an acrylic cylinder over time. I’ve paid too much for my tubes to wreck them.
For JO, jelquing, and sex I like Albolene Unscented. Oil based so not for use with condoms. I first learned about it in a tantric sex manual in the 80’s. Authors recommended it for edging and sex play with a partner. It feels indescribably amazing (as in amplifying sensations). Sold in drugstores in the make-up department, 10ish dollars a jar but it will last you forever (as in a year or more).
I tell guys here about it, and they are all whatever. But those that try it come back and say “This stuff is insane”.
See here for some testimonials:
Best Lube