Last fall changed lower unit oil. Used Pennzoil for the first time. Today was in a little bit of a hurry and started my 50 hp Evinrude 87 up. Ran for a couple of min. and herd a slight rattle. Shut it off checked oil. All gone. Checked the cardboard on the ground under foot no sign of oil. Checked the container that I drained the old oil into. Yes the old oil was still in the container. City picks up old oil the first week of June. Still had a little in the Pennzoil bottle. I know you can not tell me where the oil went but did I do much damage to the lower unit? <br /><br />Motor was running on the muffs and in neutral.<br /><br />Thanks for the help in advance.