All-aluminum engine (both block + head) in a mid-size SUV? I don't know how common it is, especially in a truck-based SUV, so the Xterra engine might be a bit unique in that regard.
According to Wikipedia, the VQ engine is widely considered to be "the world's benchmark V6 engine for its combination of smoothness, reliability and high power output." I don't know how accurate that statement is. But judging from my personal experience with the X's all-aluminum powerplant, I would not be surprised. From what I can tell, this is one sweet machine!
http://en.wikipedia.org/wiki/Nissan_VQ_engine
The VQ40DE is a 4.0 L variant of the VQ35DE (longer stroke).
Improvements include: continuously variable valve timing, variable intake system, hollow camshafts, lighter crankshaft, and friction reduction (microfinished surfaces, moly coated pistons). It has Nissans direct ignition system with platinum-tipped spark plugs. It produces 265 hp @ 5600 rpm and 284 lb-ft @ 4000 rpm.
It is used in the following vehicles:
* 2005+ Nissan Frontier (265 hp @5,600 rpm; 284 lb-ft of torque @4,000 rpm)
* 2005+ Nissan Xterra (265 hp @5,600 rpm; 284 lb-ft of torque @4,000 rpm)
* 2005+ Nissan Pathfinder (270 hp @5600 rpm; 291 ft-lbf @4000 rpm)
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