Mobil 1 makes some of the best oil filters, they will filter down to 10 microns while maintaining flow. They are made by champion labs.
Mobil 1 along with Pennzoil platinum ultra are probably going to be the best oils you can get in the "wal-mart" price range. This does not mean they are the best. Will they do great in a DD, absolutely. As stated before they are group 3, not a "true" synthetic.
If you want the absolute hands down best you need to go with Redline. Redline is a Ester based oil which is recommended for our Z's VVEL. Along with being a ester and all of its benefits, redline has a high amount of ZDDP (anti-wear EP additives).
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