My 2007 Navigator has been diagnosed with a leaking timing cover. I was quoted about $1100 to resolve it. We have maintained this vehicle well and intend to keep it for a while as our second vehicle. It is leaking a decent amount of oil when parked, but not so much that I have to top it off between oil changes. Current mileage is 137k miles My questions: 1. Is $1,100 a reasonable price to repair the timing cover leak? 2. If I proceed with the repair, would it be a good idea to have them replace the timing chain at that time?