What would be causing my MF65 to blow diesel out of the dipstick?

If your machine is truly spraying fuel oil out of the dipstick tube, you most likely have some severe engine damage, most likely originating from a leaky (dripping) fuel injector/nozzle. The fact that fuel oil is present in the crankcase leads me to believe that at least one cylinder has been overfueling, causing wash-down of the cylinder walls and resultant piston ring and cylinder wall (or liner) damage. Enough raw fuel is getting (first) into the cylinder and (second) into the crankcase to wash the normal oil film off the cylinder walls, resulting in excessive ring and cylinder wear. In all likelihood, you now have excessive crankcase pressure due to the damaged rings and cylinder walls, as compression pressure is being lost into the crankcase..

Have this engine evaluated by a professional, as a tear-down and rebuild is very likely necessary. At the very least, the fuel system -- injectors/nozzles specifically -- must be investigated and repaired...