Just curious, does your oil warning light come on with the key on, but the motor off (i.e. does the bulb & sensor work)?
I have never run low on motor oil. No leaks and no loss of oil. I change it every 4,000 miles, and never is low. 17,000 miles now, so your oil low sounds very strange. Are you checking it with the bike upright (not on sidestand!!!)? When upright, oil level should be near middle of sightglass on lower right side of the engine.
