I checked the oil yesterday, and the level seems to have risen since before. The car was parked on level ground when I checked it. I had the oil changed about 1300 miles ago, and the level was filled to just under the maximum. Yesterday, it was just over maximum and I haven't added any oil since it was changed. The oil looked clean, and no different to when I last checked. Could I have misread it, or is there a reason the leve could rise?