I'm not familiar with the Deere machines in particular, but have worked on skid steers before. These points come to mind:
1. Does the oil smell like diesel? Not a conclusive test whether or not fuel is getting in the oil, but better than nothing.
2. Is the coolant dropping?
3. How do the pumps mount on the back of the engine? Some have a gearbox to split the power to two separate pumps. I worked on a New Holland leaking from the hydraulics into that gearbox. If there Deeres are a similar setup, the splitter box oil may be making its way to the engine. Check your hydraulic oil level too, if the hydraulics are leaking to the splitter box, it may also have pressured up the gearbox and blown the crank seal on the engine as well. May be worth looking into on your old skid steer as well, if it has the oil-filled splitter box that is.
That's about the only things I can think of that could cause fluid movement into the engine oil. Unless it has something exotic, such as a hydraulic oil/engine oil combo cooler, but can't really see it.
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