Is iy possible for a bobcat to leak hydraulic fliud into the engine?
Which Bobcat do you have? Are you getting hydraulic fluid in the engine oil, or in the coolant? Is there a hydraulic pump mounted on the engine? Where is the hydraulic oil cooler? You're gonna have to provide some more details if you expect very much help.
Are you sure its hydraulic oil and not diesel fuel.
How do I start my bobcat F series without the code
How do I start my bobcat F series 763 skid steer without the starter code
How do we know its not stolen. Not saying it is but nobody wants to educate the thieves. If legit contact your dealer.