[Tim]

Good to hear that the crack is not leaking. That lower bolt extends into the oil pan and oil can leak around the bolt itself. If the rear oil seal were leaking, the oil should be running down from the center of the flange. You can try sealing around that lower flange bolt with thread sealant or locktite. You will first need to drain the oil, remove the bolt and clean up as much oil from the area as you can to increase the chance of success with the thread sealant.

Also, there is still a chance that the oil is leaking around that bolt because of the crack that appears to start at the bolt hole. Even with that, you still may be able to seal it and get through the season.