Thought I should share this recent experience.
I have a 2.4jtdm with 130,000 km on the odo.
I recently had to do a forced regen (about 600km ago) and I expect that the dpf filter is somewhat clogged.
Reading other threads, I thought I'd add a small amount of low-ash 2-stroke to the diesel. I added about 200ml to an almost full tank.
First 25kms, no problem. Then the dreaded engine management warning light came and the car went into limp mode.
Continued reading threads and found that others had been able to force a regen (even if in limp mode) so thought I'd give it a shot. Drive late at night on a freeway, staying in 3rd gear at around 90km/hour for about 30 minutes. Can't say I noticed a regen occurring. However, by the end of the freeway run, the car was no longer in limp mode, though the warning light remained.
The following day, no limp mode but still the warning light.
Today, no warning light!
All is good. Also, when I switch off the engine, there is no more of the burnt diesel smell wafting around the car!
Not sure if it is too early to call but the car does seem to have smoother power delivery and is a little more responsive in the low-rev range.
I'd be interested to know what others think. Did adding the 2-stroke itself cause more deposits in the dpf or did adding the diesel cleanout the throttle body which then caused more deposits in the dpf?
I am waiting on delivery of the cable to connect the Fiat ecu scan software to see exactly what error code was logged when the light came on (I assume it will be stored somewhere in the ecu).