Racer: My general point is that just because the VW 507.00-spec oil is required for the 2009 TDIs, that does not make it the best choice for pre-2009 TDIs. It has unique qualities which are not required for the older engines.
Some folks believe that both the VW 507.00 oils and the API CJ-4 oils may not be as robust as the older formulas, that they have been weakened to protect emissions equipment. I don't know if this is true, and I am currently running the CJ-4 version of Mobil 1 Turbo Diesel Truck 5w40. I plan to stick with the 10k-mile OCI that I've used since my Golf was new, but will eventually test to see how it's doing. $7/quart is pricey enough, I am not interested in paying $3 more for an oil that's no better and probably not as good.