Is my Peugeot 207 leaking Eolys fluid?

I just noticed a leak from the rear of my Peugeot 207 HDI. I've been told its Eolys fluid. Is this serious, and why would it leak?

Why's my Citroen C4 VTR's de-pollution warning light illuminating?

My 2005 Citroen C4' VTR's engine management light keeps lighting and telling me the de-pollution system is faulty. Any ideas?

Where do I top up my Peugeot 407 HDI's emissions particle filter fluid?

I have a Peugeot 407 HDI. A warning signal comes up saying I need to top up my emissions particle filter fluid. Can anyone tell me if I can do this myself and, if so, where it is located?