Hi, it is really best to let the regen complete its process with the engine running. For a regen to take place, if you peform only short journey's, a quick blast for 20 mins or so once a month on a 'A' road would actually suffice. the choice of diesel versus petrol is mainly down to mileage.
Hopefully that is the best choice for you, however I would suggest, give it a 20 minute, high rev blast down a motorway once a month, to keep it in tip top condition.
You need to give it high revs, for high heat,which cannot really be done on A or B roads, due to the slow - fast approach of driving around the bends...
passive regeneration is invisible pretty much, you would just notice a lower MPG if you were looking, and if you have something like Torque Pro, you could also see the temperatures increasing around the exhaust area.
Active regeneration is a light you dont want to see, but to be fair, I suspect that your CDMF shouldnt need it.
Who do you use as your local ford dealer? I tend to use pier road dagenham motors in Gillingham as they tend to be very good and honest.
A 70mph run in fourth gear will usually do the job, as long as the exhaust heats up enough to burn off the carbon deposits you'll have no problems.
Ford used to use an Eolys fluid additive to lower the burning temperature of the carbon so it would regenerate at normal driving temperatures but it was a bit of a faff, the fluid was expensive and refilling was a messy pain in the rear.
Hi, actually 60mph in 4th will be fine and it does not have to be a motorway at all. I once owned a Mk4 Mondeo 2.0l diesel and it was always used around town for very short journey's. All I did was once a month took it for about a 20 mile around trip where I forced a regen by working the engine hard. Even with a passive regen it was obvious it was taking place because the engine note would change, heat would be coming out from underneath the car and the cooling fan was on continuously. However the OP is doing everything correctly and shouldn't have a problem at all.