1st Gen - 2.4L 4 Cylinder - Chain
1st Gen - 3.3L V-6 - Belt
2nd Gen - 4.0L V-6 - Chain
Like others in the VQ series, the new 4.0-liter version includes such advanced design features as Electronic Throttle Control with secondary mapping in 4LO (4x4 models), Continuous Valve Timing Control (C-VTC), Nissan variable Induction Control System (NICS), silent timing chain, microfinished camshaft and crankshaft surfaces, molybdenum-coated pistons, resin intake manifold, digital knock control system, high capacity muffler, lightweight aluminum block and platinum-tipped spark plugs.