Surfing over from the olde XF list:

There's a brief review of the new XF in the current issue of Car&Driver. They like it, but they got one thing curiously wrong. They claim that the V6 engine is a 60 degree engine and that is kind of strange since they usually are so accurate. I believe that it is actually an AJ-V8 minus 2 cylinders.

But they did note (correctly I assume) that is used balance shafts. It was that note about shafts that I actually noticed first. A 60 degree engine is well balanced (like a 90 degree V8) and therefore doesn't need shafts.

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Jaguar: Grace, Pace, and Space - Sir William Lyons
Current Hers: '13 Lexus ES 350
Current Mine: '08 Jaguar S-Type 4.2 "Satin Edition" (250.06 whp / 259.67 torque)
Past Ours: '05 X-Type 3.0/auto Jaguar Racing Green

 

The V6 engine in the Rover 75 I had before the Jaguar was a real peach, and it was a 90 degree engine. The crankshaft has three throws, but each crank pin on a single throw is displaced by 10 degrees to give even firing intervals, in effect making it a virtual 60 degree.