Note: The VRO's are often to blame for the overloading symptom....why? If it injects oil while boat is not running, the vent for the oil reservoir my be stuck. It is in the cap. You can actually open up the cap and remove the wee vent valve, and little spring. It really isn't needed unless you expect water up over the top of the reservoir. I have fixed many VRO's with this symptom in this way. The motor will experience heavy smoke when first fired up and until underway. Once running, and the oil reservoir pressure is stabilized, the system will function properly. The VRO itself is not at fault. Use of ethanol can destroy VRO's. Replacement models are marked "ethanol resistant". Take that with a "grain of salt".
Here is the problem, I keep em in a pill bottle, not in the oil cap.