What kind of engine oil is the best for a [DSM]?

By far the most important aspect of engine oil is to have the proper grade.

Update: Check this article (PDF) written by Forced Performance | Recommedations for Motor Oil

As is true for many automotive enthusiast groups, DSMers generally recommend fully synthetic oil for general use. Synthetic oils can withstand higher temperatures than mineral oils, and contain less wax, which theoretically leads to less residue building up in the engine.

However, some members stick with semi-synthetic or regular oils, and may or may not change them more often than recommended. A good case can be made for using either type of oil, so it usually comes down to the owner's personal preference.

Engine oil brand is even more debatable than oil type. There are dozens of brands on the market, each slightly different from the last. Fortunately, almost all of them will work just fine in all autmotive applications, including DSMs, allowing owners to pick whatever brand they have confidence in.

If you have deep pockets, these are talked about:  Brad Penn, Royal Purple (w/ Zinc. Not RP canadian Tire version) and Rotella