Checking in with a 13 LX at 156K. Was at dealer having preventative maintenance done (Transfer case and differential Fluid exchanges as well as a PCV valve replacement) and the technician said I have a small cam tower leak. He said I would need the cab to come off the frame and repair is 20 hours of labor. He thinks I have plenty of time before it would get bad, but I’m wondering what I should do. I don’t want to be breathing burnt oil fumes.