Jack, I use a 10W hydraulic oil that I get from my local petroleum dealer, it doesn't matter the brand name, just make sure it's hydraulic oil. I already posted links to RCSparks on pg89.
https://rctruckandconstruction.com/s...postcount=1780
Yes Jim, tracksandtreadslou did the sprockets for me, using cad software Lou could figure out exact pitch of teeth within the diameter parameters I had to work within.
The holes in the pads expunge small debris that may get into the track link when turning; I'm always careful to turn very gradual anyway, but it's an added bonus to have the holes.