If this is eng oil and not fuel,I had that prob, mine was where the dipstick enters the pan, there is a round metal pad that connects with a very large nut. there is an o-ring INSIDE the pan that goes bad. Sometimes tightening the nut will stop your leak, otherwise, you must replace the oring. This can be done without dropping the pan, but look up how to do it on this forum or pm me and I will see if I can find the link. good luck.