Do any of you use deisel fuel supplement on a regular basis? I was told(by the vw dealer) not to use any type of fuel additive because of the possibility any additive would cause the injectors to sieze. I have an older deisel truck and have used a cetane/lubricant additive on just about every fill-up. Never had a problem. Is the VW PD engine built to tighter tolerances thus preventing anything other than fuel from passing through the injectors? He also told me to use only VW synthetic oil as no one else had an oil compatible. Glad I found this site. Thanks, Don. 2004 Beetle TDI.