I thought you wanted pure castor oil due to its high temp resistance?
Well, castor oil is a good for some stuff, but I don't think its thick enough to work in my front diff.
I didn't build my serpent (bought it used), so when I am working with the setup I had no idea what type of oil was in the diffs. I assumed it was stock (80K front, 30K rear), but I wasn't sure. So I bought some diff oil and refilled them, so I now know exactly what fluid is in them. Problem was shaver didn't have any 80K, so I bought 30K, and 120K. Mixed the 120K and 30K to get close to an 80K.
As for fuel. I am still running 20% Blue Thunder Race (aka Smurf Piss). Works well enough, and I can get it from Shaver.
Cheers,
Shawn.
