if its a bath type chain case, I would gather 10x30(40) motor oil is all you need
a simple call to your local Case dealer should net you correct info too, if you don;t have a service manual with the correct info!
Which oil to use for your Case Skid steer loaders 85XT (1997 - 2005)? A complete overview of all components such as the engine, transmission (transaxle), brake system, power steering, and cooling system.