Why swap from 4.0 to 4.2? - Lounge Lizard
In about 2002/2003 Jaguar changed the engine from 4.0L to 4.2L.

(1) Why did they do this?

(2) Will a 4.2 use more petrol than a 4.0?

I'm thinking of getting one, subject to not getting sacked from current job and fulfilling other private business objectives.
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Jaguar XK8: Why swap from 4.0 to 4.2? - Armitage Shanks {p}
1. Probably wanted a bit more power.

2. Maybe not, depends on your right foot, to a degree!
Jaguar XK8: Why swap from 4.0 to 4.2? - Kevin
The 4.2 is slightly more powerful and slightly more economical.

Check the Jaguar.co.uk website "locate a used car" section to compare the technical specs of the different models.

Kevin...