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Yes, oil out of the unloader = bad seals in the valve. The fact that it unloads near shutoff also indicates you have a faulty hydraulic unloader valve. The small line leading from the HP (high pressure) unloader tower sends the air that is exhausted from the pump into the cylinder head just upstream of the LP (low pressure)intake valve,inside the head just after the air filter. This is done simply to reduce noise. If you take off this small line, you should hear a brief puff of air at shutdown, then silence. If there is air coming out of this line continuously after shutdown, you have air entering the pump, either from the unloading system, via the hydraulic unloader through the signal lines, to the unloader towers (which indicates ripped diaphragm seals in the towers), or, air is coming back into the pump through the HP exhaust valve, and is being dumped out through the port on the unloader tower while the compressor is shut off. Pull that line and check for air coming out. I bet that's where it's coming from. You will need to remove your HP exhaust valve and check to see if it is sealing properly. I don't have torque settings for the threaded collars. Just back them off before you bolt down the valve covers, then turn them on tight (by hand) with either a hook wrench, or a flat piece of steel fit into the notches, then install the tower. The crankcase vent line just needs the O ring renewed where it slides into the crankcase. These are never very tight.
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