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For example, the Afton HiTEC® 11410 passenger-car engine-oil additive package reduced-SAPS top-tier additive technology, ACEA 2016 C2/C3/C5 & API SP is 177 cSt:
HiTEC®11410 Passenger Car Oil Additive | Afton Chemical
HiTEC®11410 Passenger Car Engine Oil Additive Package for Reduced SAPs Top Tier Additive Technology. Click here to download the Afton Product Data Sheet today.www.aftonchemical.com
Incidentally, seeing how these cheap generic add packs are ACEA & API dual-certified, we know how the European oils are overrated over API oils.
The best information about how the viscosity depends on the base oil, DDI pack, and VII with tons of systematic data can be found in the Hugh Spikes paper. It is open-access:
VII (VM), shear, base-oil viscosity, HTHSV, friction, and wear: State of the art
I will discuss a recent paper on the subject in this thread.bobistheoilguy.com
OK, so are you just fudging it based on a rough guestimate? As I said, I came up with 48cSt for that particular oil, but clearly it is going to vary. If I can make a suggestion, how about a column that just has BO KV100 (no DI package) and then one with the combined like you are doing presently?