Don't know whether the unit would be worthwhile- not mine, etc.- but the item description claims to be excerpted from the SAE paper on the VW turbodiesel. Interesting reading. http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1829085915&r=0 &t=0&showTutorial=0&ed=1021950796&indexURL=0&rd=1 Scott Kair