If this is true and the absence of that plug just allows unfilter oil to circulate, why do those motors eat their bearings and in such a short period that its not just dirty oil. I agree that the plug does divert
Oil to the filter, but it also alters how much oil is seen through out the motor. Without the plug they will show pressure, but I wouldn’t feel comfortable saying it couldn’t show on the guage. Pull tge sending unit stick the rod in and eliminate that possibility.
