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I contacted the dealer regarding having the main tensioner replaced (loud chain rattling noise-which is common for XL7s) and possibly the timing chain. He told me that I should have all 3 tensioners replaced since the repair is extensive and pricey, so I wouldn't have to bring it in again for another tensioner repair. BUT I asked him at what mileage does the timing chain need to be replaced and he told me never. I'm skeptical about not replacing the timing chain as well. Please Help!