JimR,
Your machine is more Mitsubishi than Cub, or Mits under Cub's clothes....correct me if I'm wrong. You most likely have a few more options either by parts from Mits's or other synthetic fluid readily available from TSC and the like...
The machines made by Cub use the sythetic blend that would be the garden tractors (2000 to 3000 series), 5000 series and some of the 7000 series (not all of them) for example...
I have found no one who successfully found an alternate, some have said they will but never heard back from them ever again....Many folks have asked, so far no solution worth
broadcasting /forums/images/graemlins/frown.gif
Jtkub,
You lost a gallon when you switched the filter? what happened there, did you answer the phone during the process? <just kidding> its a slippery mess I know /forums/images/graemlins/smile.gif