DPF Chemical Believer

One of the many problems with a diesel car is the diesel particulate filter.  I usually have problem in winter, as the exhaust does not get quite hot enough.  When after a long drive, the DPF light came back, I decided to get the most expensive DPF cleaner and stick it in.

I used to put chemical in, but some mechanic said they do nothing, so I am not religious about them.  Then after I stick this expensive DPF cleaner in, the light came off after 10 miles driving and stayed off.  I am now a born again additives believer!