You have to know where it is coming from, if your block is coverd in oil and grease you wont easily be able to tell if there is any new on there. I say, clean it off like Yerdonrw said and see if you can spot the leak. You might just get lucky and its leaking out a easy to fix area. It might just be coming right out of the pan, you never know.
let us know what you find out.
Best of luck to you and MERRY CHRISTMAS :kooky: