Oil Viscosity Mixer
Estimate the grade of mixed engine oils.
Estimated Viscosity
SAE --
Based on kinematic viscosity @ 100C.
Note: This is an approximation. Additive packages may conflict. Generally safe for top-offs, but a full change is always better.
SAE J300 Viscosity Chart (Kinematic @ 100C)
This table shows the approximate kinematic viscosity ranges (in centistokes, cSt) for common SAE engine oil grades at operating temperature (100C / 212F). Our calculator uses the center point of these ranges to estimate your blend.
| SAE Grade | Min Viscosity (cSt) | Max Viscosity (cSt) | Typical Center (cSt) |
|---|---|---|---|
| SAE 20 (e.g., 0W-20, 5W-20) | 5.6 | < 9.3 | 8.5 |
| SAE 30 (e.g., 5W-30, 10W-30) | 9.3 | < 12.5 | 11.0 |
| SAE 40 (e.g., 10W-40, 15W-40) | 12.5 | < 16.3 | 14.5 |
| SAE 50 (e.g., 20W-50) | 16.3 | < 21.9 | 19.0 |
| SAE 60 | 21.9 | < 26.1 | 24.0 |
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