Infiniti's QX4 may be a remodeled Pathfinder--but it's a darn nicely remodeled Pathfinder, and Nissan's upmarket division has added enough content and style upgrades to differentiate the two. We were just a few hundred miles early for the QX4's 11,250-mile service, as the driver-side power window was operating intermittently. The window motor was replaced under warranty, and the problem has not recurred. The shifter also feels a bit sloppy in its gate; upon inspection, we were told the proverbial "they're all like this"-a bit disappointing. Infiniti's checkup is quite comprehensive, including oil and filter change, tire balance and rotation, several diagnostic checks, the topping of fluids-even a wash and vac. A bargain at $133.86, and the Q-by-4 runs like the proverbial champ. Our biggest complaint is the intermixing of the HVAC controls with the nav-system touch screen. For example, to adjust the temp, you simply use a dashboard control. Yet to adjust the fan, you must first press a dashboard button to access the Nav touch-screen, then adjust the level from there. Why?