Hi, Mick. On the topic Terraclean [a separate topic], Jim has used it on several cars and thinks highly of the service. I have been put in touch with a local Mobile Terraclean mechanic, and have asked him about the EGR valve cleaning service. I have also said that I am interested also in a full diesel Terraclean in a couple of months. It seems to do wonders with the emission issues on a diesel. I am waiting for his email, and will let you know that result. I have relooked at the Ed China video, and the product does seem something that is useful. In my first few years of car ownership I used to do my own servicing, on both mine and my wife's various cars with a fair amount of success, but when the Company car came I was required to use a dealer while they were under warranty, and as they were changed annually that was all the time. You get out of the habit and after I retired my wife sold her Red EFI Escort Convertible, so I didn't have a car I understood to play around with. Now with my 80th Birthday coming up, I don't get oily hands or get underneath cars any more. Regards, Peter.