Q: It has 116,000 miles on it now, how many miles do these things usually last?
A: Around 160k the timing chain guides wear out. GA-16 motors were not powerfull enough in the first place dust and motor wear will lessen the power output. Just keeping fresh oil in the engine often will make it last a long time. 14 years ago cars were not as safe or get the horsepower and fuel milage of the new 2.0 sentra MR20 motor with side air bags and CVT transmissions.