Kirk Sorry for the slow reply. Mine is a gas, it takes 10w-30 oil in the engine, and also 10w-30 in the chaincases. The hydraulics takes 10w-30 also, however Case recommends you use their additive in it also...one liter per fill-up, which I think is something like 30 liters. I don't have a manual either, but some searching came up with this. I can't remember what the name of the additive is. I haven't changes all my fluid yet, just topped it up, as it still looks new. I believe the diesel is a Kubota. If it is, it may also take 10w-30, but diesel rated. The two Kubota diesel engines I have, one in a sub compact tractor, takes this for oil. If you haven't found out about all this already, do some searching, and you should be able to come up with the info you seek.