I was unable to retrieve the serial number because part of the tag is missing. Is there anywhere else on this tractor where the number would be? On the air cleaner housing it says manufacture date 1199. I checked the oil, it does not look like there is water in it but it is way over full, about one to one and half inch above max and I am sure when I changed the oil way back when I did not over fill it. I am wondering if gas may have gotten into the crank. I can't tell for sure. How can you tell if there is gas in the oil? I smelled it but I can't tell for sure. If it is gas, where would it be coming from. I started the tractor and it fired right up, ran like a champ. Any suggestions welcome. Thanks.