Missing lots of info , good answers require complete info .
You said nothing about your truck and or mods , so any answers are just ruff guesses .
Even though many are good generalizations .
Go to the user control panel fill in details about your truck & mods .
As an example , I bought my truck used , it had about 100 HP over stock , no info from 1st owner , but I used oil analysis , with Rotella 15-40w , soot levels were very low , TBN number were good , 2 different labs , kept telling me to extend my changes , I was at 12,000 miles , when I switch to Amsoil .
Its the same as trying to fix a problem , test to find whats wrong then replace only whats bad , not replace parts till the problem goes away .
Use analysis to know when to change oil , and watch for issues developing in the engine .
Now I am running Amsoil 15-40w HD marine , with dual by pass .