Oil weights explained starts with recognizing that viscosity changes with temperature. This viscosity, or thickness, directly impacts lubrication, fuel efficiency, and the overall lifespan of critical components.
Oil Weights Explained Maintenance Decision Tool
The number preceding the "W" quantifies the fluid's resistance to flow at low temperatures, measured in centistokes. Viscosity Index and Shear Stability: The Hidden Metrics.
A higher number generally indicates a thicker oil that forms a more robust lubricant film, which is necessary for engines with high loads or precision clearances to prevent metal-to-metal contact. High-performance or turbocharged engines often require the thermal stability provided by higher-quality synthetics with precise weight ratings.
Oil Weights Explained Maintenance Decision Tool
An oil that is too thick when cold will not circulate quickly enough to protect the engine on startup, while an oil that is too thin when hot will fail to maintain a protective film under stress. This high-temperature rating is determined through rigorous testing to ensure the oil maintains a specific thickness, or resistance to shear, under heat and pressure.
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