Oil in the radiator - 6 cylinder diesel

Hi,
We have a Furakawa FL 230 FEL with a Mitsubishi 6D20 diesel engine.
This evening we ran it levelling off loose ground for around ten minutes, then it ran out of fuel. When my dad refuelled it, he noticed that the manifold was smoking badly. I don't think it has any exhaust leaks.
When he looked in the radiator there was a layer of engine oil at the top of the radiator. Water has never been the cleanest, but never oil in it. Whenever we check it, it always has water in it.
It always smokes a lot, but is that normal for a diesel engine of that size and age?
Please any help appreciated!
Joshua
PS how many ton is this loader? Have been told 15 ton but likely more.
 
Marloweg has it oil cooler. If you want to test it you need to block off the port then with it in a pan of water heat the water till it shows up. Pressurize the oil side and it will bubble when it gets hot enough to leak. Heat to engine operating temp.
 

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