 Only 85k miles.  Sentra has mechanical problems.  Recent dealer service quote:  will need to replace head gasket, valve cover seal, front crank seal, exhaust manifold gasket, and the intake gasket and all spark plugs.  Drive belts are heavily cracked.  Timing chain stretched needs tensioner and guides.  Past issues:  Oil dip stick broke resulting in removal of oil pan with NTB and dealer service pointing fingers.  Brake calipers malfunctioning causing abnormal pad wear and short rotor life on left front.   After +$2,000 in repairs, the Sentra  just is not  worth it.  Have owned a Geo Storm, Honda Accord, Chevy Blazer, Ford Mustang, and Jeep Cherokee.  All lasted +130k miles.