hope its fixed!!
however, self have built a few motors and all my motors leaked a little on the seals!! was missing a small trick that when I built my last motor I used and on a motor that is prone to oil leaks, does not leak oil!!
on the crank where it runs on the seal, ruffen it up with some sand paper
so it will be all polished from the seal running of the crank, use some sandpaper to make it dull
the problem/difficulty comes with doing it with the crank still in the vehicle and preventing things from falling inside the motor!!
then when fitting the new seal, put some grease on the seal to prevent it from running dry when starting up
hope this helps