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Estimate the theoretical sulfated ash a metallic detergent or other metal-bearing additive contributes to a finished oil, per ASTM D874.
On ignition + sulfuric-acid treatment each metal ends up as its
sulfate. Theoretical sulfated ash from metal content: additive ash (wt%) = metal (wt%) × F
contribution (wt%) = treat rate (wt%) ÷ 100 × additive ash Metal → sulfate factors F (sulfate MW ÷ metal mass):
Ca→CaSO4 3.40 Mg→MgSO4 4.95 Zn→ZnSO4 2.47
Ba→BaSO4 1.70 Na→Na2SO4 3.09 K→K2SO4 2.23Theoretical value from metal content; measured ASTM D874 can differ slightly (boron, phosphorus and some metals form oxides/phosphates). Prefer the additive TDS ash figure when given.
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