VW Jetta IV TDI stuff

I have a VW MK IV Jetta wagon TDI. This is information I find useful to me, so I put it here. If you have a different VW, it might be useful to you too. You might even find some of it usefull if you don't have a VW at all.

So, although it might be, if it doesn't say otherwise, don't count on the info here being relevant or accurate to something that isn't a '04-'05 VW Jetta TDI wagon.