Kinematic viscosity of a base-oil mixture (reference case)
Kinematic viscosity of a blend of two base oils by weight percentage, for one worked reference case (40 mm²/s and 20 mm²/s oils, 50% by weight, at 40°C). The original site never ships the blending formula client-side — only this login-gated worked example.
The "Temperature" select (K) is only ever compared against its reference value (4.1, i.e. 40°C) in the source — it does not otherwise participate in a formula here. There is no blending equation in this source to generalize. This module reproduces the gate exactly: change any input away from the reference case and the output is undefined (NaN), matching the original blanking the field.
Method & references
- Kinematic viscosity of a blend of base oils, by weight percentage.
- The legacy client-side source contains no blending formula — only a login gate around one hardcoded result for one reference case. This port is faithful to that: it is not a general blending calculator.
The computation is a literal port of the original client-side JavaScript from /calculators/oil_mixture.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.