Was at my mechanics today (out of warranty) and I was asking what they charged for the timing chain service (88,XXX miles). He asked if I was hearing any noises from under the hood and I said no but Nissan recommended the timing chain service at 105,000. He told me to just keep the oil changed and until I start hearing something to not worry about it. He did go on to mention the pretensioner problems some Frontiers have but said I would hear it if that occurred long before any damage was done. What's the most mileage anyone has heard of without the timing chain service? Should I listen to him or insist on the service at 95-100K?