Combines Diesel fuel in Motor oil

if it is running a bit rough, it could be a bad injector washing down a cylinder. if injectors are good, the only other place would be an internal leak in the injection pump, letting fuel into the lube oil of the pump that is shared with the engine.

I just talked to them tonight and apparently it was the injector pump. It is rare for this to happen but evidently it does once in a while. They had their pump rebuilt and it seems to work fine now. Take care, and thanks for the reply. Kevin