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Powerstroke engines that display this will have bad injector o-ring seals.
These engines can also put the oil back into the fuel system.
Other diesels that have this problem will usually have an injector leaking down and/or a mechanical transfer pump that has a blown seal.
Injector jumper line leakage.
(powerstroke57)
This is a rare mix for the 7.3L powerstroke. Typically we have Fuel in the coolant, or oil in the coolant. As for fuel in the oil assuming it is the 7.3L I would have to say yes it could be injector o'rings. It's the only thing in the entire engine if failed would do this mix. This is because the injector has oil and fuel in them and those fluids are seperated by the o'rings. This would be my starting point to look their. Good luck hope this helps.
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