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OG Images.
https://oil-glup.ru/threads/krestan-tbn-i-prochie-tbn-50-neverojatnaja-i-neobjasnimaja-uoa-maslopurga.39/#post-615
Figure 4 compares oil aging across vehicles A, B, and C by plotting DSC, TBN, TAN, and PIN values against distance traveled in km up to 20,000. Solid vertical lines indicate oil change points determined by lab oil analysis, while dashed lines show recommendations from the onboard Oil-Life System. As mileage accumulates, TBN generally decreases while TAN rises, showing how fluid chemistry shifts during service.