The Citroen Visa Forum

If your Citroën was built post 1998, it should be able to cope with the higher levels of ethanol in E10 petrol. That means problems for the Visa. The latest information that I have seen indicates that when E10 petrol replaces regular unleaded petrol in the not too distant future, you will need to use the higher octane unleaded fuel [eg. 97/98 octane] that will still keep to the E5 ethanol level. There is a lot of information on the internet with dire warnings about corrosion and other serious issues if you use E10 in an unsuitable engine/fuel system.

Those of you who are not running on the top grade of unleaded fuel at present will have the shock of paying 6p or more extra per litre.

The change, IIRC, is that up to 10% will now be allowed without it having to be labelled as such. It doesn't mean that all Regular Unleaded WILL be 10% ethanol.

Here in Finland we have that E10, and it's labeled. The 95 E5 we do not have anymore but 98 E5 still exists.
Some Citroën people drive E10 over a year without problems. Finnish importer says that E10 is ok, models build 2000 and later.
All my cars "eat" 98 E5 'cause i do not want to use E10