Yes I used cheap oil mixed with the Sea Foam. If you get it local it will probably cost you 8-10$ a can I used two cans. I ran mine for short periods while up on a lift, until the milky went away, then went riding for 30 or so miles changed it again....did that twice. Amsoil carries a very similar trans fluid though I have never used it. Always went back to the AGL fliud from POPO. Both are synthetic.
Amsoil part numbers... TCC chaincase lube Part numbers 2871280, 2871478 and 2873602