When ever I buy , new or used , I change or do all maintainance , so I know how to plan future maint. , the only difference with new is never assume that all the metal chips from manufacture are gone , so I've been as finicky as soon as getting truck [ highest % of getting chips out before damage ] , but you want to run a non detergent oil for break in , so that is where the ? is , many joke about these eng. s not being broke in till 80,000 miles ??? , the point being that you want the new parts to break in , so no special oils [ thats excepting break in oils , non detergent ] Not sure about you choice of oil , may be a good oil for after break in .
So for a answer after the right away , then break in , maybe every 3-5,000 [ you also want to flush out any break in stuff ] till you hit 20,000 , then you have to figure your own long term plan ,
I am using Rottella 15-40wt , have been doing oil analysis , to see condition of eng. - contents of oil & a TBN - condition of oil additives , then change on there recommendations , the last few checks , they say go farther , I'm at 11,000 with a TBN of 9+ , and all contents at normal of below .