1.   Both are motivated by in-line six-cylinder engines with highly efficient variable valve timing.

2.   Variable valve timing assures that most of this power is available at very low engine speeds.

3.   What it does is change the valve timing and lift by making small adjustments to the dual-overhead-cam system.

4.   With its variable valve timing and four valves per cylinder, this engine is among the most durable the big automaker has ever built.

5.   Valve timing settings that give priority to low-to-mid-range speeds are used to make the car easier and more tractable to drive.