I've been using Butcher Block Oil. Food grade. Humidity, or lack thereof is a problem, in Wyoming. I usually use a drop and some 0000 steel wool to clean the finger gunk, when I change my springs. Keeps everything sounding nice and warm.
I'm rolling a Bassman 800 on top of a pair of Rumble 410s. Honestly, the stack looks and sounds amazing! Usually for shows though, I only run a single 410 through that Bassman. If I need that 810 configuration for a show, I have it.
Hell, I've had numerous brands and cost points. The bass in my pic is an Ibanez GSR205. I love it. I have a cheap ass Silvertone P Bass. I love it. My only expensive bass is my EBMM SR 4HH. I love it a lil bit more ;)