Walk Behind Lawn Mowers

On Friday, I purchased a new Husqvarna walk behind mower. I have read in at least three separate places in instructions or tags that there is no oil in the engine. However, I started pouring the oil that came with the unit into the oil port and almost immediately it overflowed. Before I put the oil in I could see there appeared to be something wet on the dipstick. It appeared to have the consistency of oil but was clear. Of course, in retrospect I should have tipped the mower to see what came out. Now I am wondering what to do. Suggestions?