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Link to article about strong sales of TDI. TDI's should be somewhat easier to find this Fall when gasoline prices are not so high.
There are others that are OK. Forget about the dealer Castrol. It is OK but not as good as the above. Below is a link to info on where the oils can be purchased.http://forums.tdiclub.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=5&t=001427&p=
I use Mobil Delvac 1 and get it at Farm and Fleet Stores for about $19/gallon.