I've done this on 3.0s a couple of times many years ago. They are TTY, and they do take oil. Plus the ones I had were metric Allen bolts so you'll need a special bit as well as finding the torquing procedure, which I've forgotten, but it does involve an angle gauge. A general PITA and it may not be worth it for $1500 retail value when you can scrap the car for $500 or more.