Dear Freddy, thank you very much for giving me the WS2 the other day.  I drove around for a few days and I can already feel the difference in my Hilux.  Engine much quieter, runs more smoothly ... haven't checked fuel consumption as yet but I think it will improve too.  I will let you know once I do my fill up over a few 100's of kilometres. 
Much appreciated, once again thanks a lot. 

Cheers, Attila