I'm considering the purchase of a 2005 TJ Sport with the 4.0L I6. Crawled around underneath and found an oily mess... Would like your thoughts. Mine are rear main seal or valve cover leak. Curious to know approximate cost of repair for both. Owner says it occasionally drips oil in the garage but not much. Says oil level remains steady--but the entire drivetrain is covered in old oil, which appears to have been blown back by the wind at speed. Including photo of engine compartment. Jeep clean otherwise. Frame in good shape. Asking $17500.