Oh and one more thing.
The original plugs are now rare, and you are likely to get the AGSF32 plug which is hotter, but recommended for the 2.5V6 Fords.
Search the ST220 forum for chapter and verse.
However the NGK equivalent (not sure if this is equivalent to the 22 or the 32), is PTR6F-13. That's what I'll probably go for when I change.
