What power mods? intake? exhaust? tune? premium fuel?
Thread starter needs an oil temperature gauge. This will help you pick an appropriate grade of oil.
UOA would be good if it included TBN/TAN/nitration/oxidation/particle counts... one needs to see if you're driving style and interval are a good match to the oil, or a failure.
I would use ANY 0w40 or 5w40, or higher HTHS 5w30. Maybe look for oils with a good amount of PAO/ester/GTL and avoid lesser groupIII swill until your radiator shows up and helps control temps.
Don't neglect the diffs, transmission, and transfer case. All the other fluids/filters need to be changed/ungraded more often.
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