Hydraulic oil from Walmart works pretty good

Canopus 13 or Corvus oil from Texaco works well also (sometimes spelled "Corvis")

<font size="5"><font color="#FFFF00">Best</font></font>
Aeroshell Smoke Oil
Texaco Canopus 13 or 19
Texaco Corvis 13

<font size="5"><font color="#FFFF00">Good</font></font>
Exxon Telura 613
Petro Blend Smoke Oil
Shell Carnea 10 or 22
Shell / Exxon Carnea E-15 (10 weight)
Shell Vitrea 13 or 22
Super-Dri</p>

<font size="5"><font color="#FFFF00">Acceptable</font></font>
American Rayco 460
BP - Enerpar 20 (viscosity rating of 10)
Citgo Sentry 15
Conoco / Phillips "Industrial Oil" (10 weight)
Conoco / Phillips 80N and 70N
Meadows Concrete Form Oil (oil base), (stinks but it works)
Unocal 76 - 76 Klondyke</p>