Ford TDCi series III vs series IV - Flat in Fifth
Looking at Ford's website it appears that you can order a Mondeo with either:

TDCi 130PS Series III

or:

TDCi 130PS Series IV

I assume that the latter is Euro IV compliant, but most of the specification figures are identical.

Is this just a situation where one engine is being phased out and the updated version introduced.

What is the technical difference between the two? ie what have they changed?

FiF