Moin, I have a 6 Golf TDI common rail DSG. The product is really great. Always had a nail and behave bad light-off. This is also due to the "normal" diesel because there is bio diesel in it. This can not be completely burned and then stuck in the system / DPF. So there is a unrunderen running of the engine. I have the diesel tank cleaner to gegebn and after about 200km to improvement sets. He jumps at better and you can hear in the stand the gentler of the engine. At no time did any problems with the product. the consumption was a bit down on Show Average 5.4 liters.
But I had some trouble with 1 tankful lm Diesel System Cleaner and at the 3rd level of filling there was lm diesel particulate filter protection that did not want the motor. This constellation was cruel. Arges engine shake, nail ..... etc.
You could also pay by LM the diesel lubricity additive! !!!