Hey I thought, seeing this thread come up from long ago. Just the kind of thread I wanted to read, as a XF prospector. WRONG! What a waste of time.

 

Well the decision to make the 3.0 and the 5.0 based on the same blocks was a very wise one from a manufacturing point of view.

Jaguar is a small company compared to it's very large competitors. By basing the 3.0 on the V-8 it allowed them to use a whole slew of common parts between the two engines. Since they way they did it the front of both engines are nearly identical. So the same water pump and cooling hoses, radiator, all engines accessories like PS pumps , alternators, starters and AC compressors. Even stuff like engine and transmission mounts because both engines sit in the engine bay the same way.
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RE: Worst of all, the 4 and 6 cylinder engines cost the same if not more than my 2010 XF with the V8!

I agree, and to add to that "Worst of all..." is the fuel savings they get by moving to that 2.0 thing is marginal. Can I say "Worst-er"? I know everyone is doing it, Mercedes had a nice 3.5 in their C-Class and jammed in that 2.0 Turbo and got something like an extra 0.8 mpg better... and lost my sale.

 

Ok, I relent, not a total waste of time. Just that the conversation quickly deteriorated into a political debate. Which is somewhat understandable, given the quest for fuel efficiency, whether mandated or not. The idea for the discussion was good, there were some useful comments. There are a lot of differences among the worldwide variants (including D) and government involvement.

While I'm not a V8 purist (or a V12 purist) the idea of the I4 in this Jag sounds wrong. But the AJ16 inline six as found in the X300 put out about 240hp, same as the I4T does. Vehicle weight being similar, I think the difference comes down to turbo lag, and too many gears to downshift through when calling for throttle response.

By now there should be some forum members that have lived with the XF I4T, that would come to its defense. Or, maybe not, as it was meant to be an entry level model that pulled in a few buyers who perceived that Jag was trending "green". Perhaps not enthusiasts as found on here.