VII content: effective VII content (measured by the temporary shear, not the actual solid or oil-solvent-dissolved VII content) directly given by the A_Harman index.A_Harman index: a measure of the effective viscosity-index improver (VII) content through the temporary shear of the oil.HTHS (cP) (high-temperature, high-shear viscosity).If you want to calculate these values for an oil, you can either (a) make a copy of the Google sheet or (b) download it as an Excel file from the File menu so that you can edit and work on it: > Estimated base-oil viscosity 150 Â☌ (BO DV150) and VII content of selected oils << I have now fully automated my A_Harman index, effective VII content, and base-oil viscosity calculator by building in the ASTM D341 viscosity - temperature relation (Walther formula) into the spreadsheet.
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