FWIW, I'm now running Schaeffer 15w40, which is also formulated for diesel use. However, it's a relatively low-ash formula (unlike some diesel oil) and has a killer additive package (killer in a good way, that is!). It's called a blend, but it's a blend of really good Group II oil with Group IV true synthetics (unlike most synthetics which use Group III oils instead of IV). The specs for it are better than most Group III synths you can buy (maybe all of them). The results from some analyses from my friend's Jetta have been very promising. Best of all, this stuff is about $2.50/qt when purchased in quantity, so it's way cheaper than a lot inferior oils. Anyway, this is all said in support of the fact that it is possible to run diesel-formulated oils and get good results for less money than the $5/qt synths on the shelf in your local parts store. I'm kind of assuming that's your goal.
Also FWIW, I would say if you're going to pay $5/qt and want to get oil quickly and locall, go with Mobil 1 0w40. It's a true Group IV synth (which makes the price a lot more justifiable than the Group III junk), has good specs, and actually has the VW certifications. It's substantially different (for the better) than the other Mobil 1 weights available in the US, and I believe it's even factory fill in some high-end German cars. It's really good stuff and you can't go wrong with it. Combine it with a good filter, and you could actually move to 10k-mile change intervals, thereby cutting the costs in half (I wouldn't do that with the other commonly-available "synths" on the shelf).