HI Folks......Ok...I feel like a REAL idiot here. I was changing the oil in my BX and my Gravely Saturday. Finished the Gravely and put it away. Went back to the BX to start it and move it to level ground so I could check the oil. Started it....the oil light did not go out and from the sound of the engine you could tell it had not picked up pressure yet. Revved it up to maybe 200rpm a couple of times really quick, just up and down to se iff the pump would pick up oil. Light was still on. so I drive it to level ground slowly. Total run time was maybe....a minute....or a minute thirty. Cut it off and then I remembered I never put the **** plug back in....grrrrrrrrrrr. I was on the grass so I never heard it coming back out like I would have if I have been on concrete. After hurling profanities at myself for the next 30 minutes I went and got more oil, PUT THE PLUG BACK IN, and filled it to the proper level. The motor started and picked up pressure with in a second or two. No unusual sounds and I drive it about 300 feet to the shed and parked it. The question is, how likely is it that I caused any significant damage? My feeling is that it's probably fine, but I thought I would ask those that are more knowledgeable then I about it. Thanks everyone!