I called Kioti and they really insist on Kioti filters. They say if there is a failure, and it can be traced to an aftermarket filter, they won't warranty it. ...
This makes perfect sense to me. Kioti cannot be responsible for the quality or compatibility of filters they don't control. So if you install such a filter
AND it damages your machine, it's not Kioti's problem. Maybe you could go after the filter supplier but good luck with that; I foresee a long and costly liability fight there. If it was a Kioti part that caused the problem there's nothing to fight about; the ball is in Kioti's court.
If Kioti is like most companies they don't make much (if any) profit on parts and supplies. Dealers do make something on servicing but only make money on parts if they have to stock anyway. When you consider the man-hours to research, order, receive and inventory, notify, and sell a special order part it would be a loss except the employee's (or owner's) time was already a sunk cost.
Fluids are different. Kioti provides a spec or at least a list of suitable (non-Kioti) fluids. As long as you comply, no problem. Engine oil, in particular always shows the appropriate API certifications on the container. Generic (like TSC) hydraulic fluid is harder to figure but most containers at least list some of the applications and specs (Deere, Case, etc.) the oil does meet.
Personally, my only complaint here is that I don't have a Kioti or Bobcat dealer nearby. If I did, I would have a vested interest in the quality of his support and his continued existence. As it is, I'm glad there are folks like MIE that can get me what I need.
I have no idea what point DarkBlack is trying to make.