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You don’t have a particulate filter, so you don’t need the Enviro oil. The reason you’re oil is so black is from EGR. You’ll see that people that say they block their EGR have much cleaner oil.
Delo400 is a good choice for the hotter climate that you are in, but it’s still only a semi synthetic. If you want the best, go fully synthetic, but if cost is an issue, the Delo is an excellent choice.