I have a MTD 990 and was wondering what hydrostatic fluid I should use .
I'm not sure what year it is as all ID tags are missing so I've looked at a couple of maintance manuals and depending on the year they disagree as to what is recommended .
The 140-990A says use a 20 weight motor oil with a zinc additive of .07 minimum such as Rotella 20W or Havoline motor oil 20W .
The 141-990 says to use Type F Automatic transmission oil .
I'm doing a complete rebuild/restore and I've completely draining the rearend and installing a new filter .
What do you guys use ?
I have cub cadet Hytran that they use in there Sunstrand hydrostatic cubs , do you think it would be OK to use ??
TIA , Jess