I may get chastised for saying this, however I don't think it would hurt to change the fluid to the equivalent for a "flush" not sure how long you would wnat to leave it in ? For a flush I think it would be good to (this is what I would do) cycle it for 2 weeks, then before you change it get your cub up to operating temp, ride it around for 30 minutes or more, and do not wait for the fluids to cool, as soon as you cut it off drain the hydro fluid, then fill with the called for spec fluid (Hy-tran)
Clint
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