I have a 1971 55HP Chrysler. I had to change bearing cage. I now filled my LU with LU oil. The motor was on the tilt stop when I did this. It took only 12 ouces of oil before it came out of the vent hole. That seems like little to me. Is this about what a LU would take? I did not have a pump so I could not do it with the engine straight up and down. As I said it was on the tilt stop. Did I need to add more? If so can I add it thru the vent hole?