I bought the warranty at 35600 miles. I have 38000 ish now. The truck just went in for the 35000 service ( kinda pricey ) and while it was in I told them that I heard a valve tap type of sound. turned out that tHe exaust manifold was cracked causing that tapping sound, It went away once it was hot. Warranty covered the whole thing plus put me in a decent rental...... I think it would have cost me 1500 smackers. ( said the service dept ). :bow: to the Nissan extended warranty....