Sae Grade Oil
Reference data and engineering information about sae grade oil for combustion applications.
saegradeoil
Overview
Engineering reference data for Sae Grade Oil in combustion engineering.
Key Formulas
Heat Release
Fuel energy release rate.
Air-Fuel Ratio
Mass of air per mass of fuel.
Excess Air
From flue gas oxygen measurement.
Variables
| Symbol | Description | Unit |
|---|---|---|
| Heat release rate | W | |
| Mass flow rate | kg/s | |
| Heating value | J/kg | |
| Air-fuel ratio | — |
SAE Multigrade Oil Properties
4 rows
SAE Grade(-) | Viscosity @ 40°C(cSt) | Viscosity @ 100°C(cSt) | Viscosity @ 104°F(µreyn) | Viscosity @ 212°F(µreyn) | Density(kg/m³) | Density(lb/in³) |
|---|---|---|---|---|---|---|
| 5W-30 | 64 | 11 | 8.2 | 1 | 860 | 0.0311 |
| 10W-30 | 69 | 11 | 8.8 | 1.1 | 865 | 0.0312 |
| 10W-40 | 94 | 14.3 | 11.9 | 1.5 | 865 | 0.0312 |
| 20W-50 | 166 | 18.7 | 21.3 | 2.7 | 872 | 0.0315 |
Source: engineeringtoolbox.com
Key Definitions
- SAE Multigrade Oil: An oil that meets the viscosity requirements of multiple SAE grades across a range of temperatures, indicated by a dual rating (e.g., 10W-40). The "W" stands for Winter.
- Viscosity (cSt or Centistokes): A measure of a fluid's resistance to flow. Kinematic viscosity (ν) is the ratio of dynamic viscosity (μ) to density (ρ), commonly expressed in centistokes (1 cSt = 10⁻⁶ m²/s).
- Dynamic Viscosity (Reyn): A measure of internal fluid friction. The reyn (1 µreyn = 10⁻⁶ lb·s/in²) is a unit used in imperial engineering contexts.