My 2009 Ford Focus 1.6 TDCI has 92,000 miles. I have just had the DPF replaced by Ford. I'm wondering are any products suitable for adding to the fuel tank to increase the life span of the new DPF ? I've seen the cleaner additives but I'm unsure if they're any good ? Cheers

92,000 miles is a good life for a dpf, many have problems way before that. Ford policy is to replace them as a service item at 72,000 miles which is why we don't drive Fords now.

Your car uses an Eolys addive which is automatically metered into the fuel, you need nothing else. In fact, some additives will damage the dpf.

It's ash that clogs the DPF-it doesn't burn off like soot-snake oils won't do squat. All you can really do is make sure that you use a low ash oil.

Ford and many other manufacturers have mostly switched to catalyst-coated DPFs that don't use a cerium fluid.

I've never been able to find what the intended service life of these coated DPFs is .... surely at some point the ash residue will build up to a critical level.