Matching Oil to Your Engine Low-temperature viscosity is critical because engines experience the most stress during startup. A lower first number in the "W" designation, such as 0W or 5W, indicates superior flow characteristics in freezing conditions.
Understanding SAE Drain Intervals for Optimal Engine Protection
Conventional Ratings Whether you choose a conventional, synthetic blend, or full synthetic oil, the SAE rating system applies uniformly across all types. When temperatures drop, oil thickens, making it difficult to pump through the engine's intricate passages.
The number following the hyphen represents the viscosity at the engine's normal operating temperature. A lower first number in the "W" designation, such as 0W or 5W, indicates superior flow characteristics in freezing conditions.
Understanding SAE Drain Intervals for Optimal Engine Protection
A higher number, such as 40 or 50, indicates a thicker oil that resists shearing forces and thermal breakdown. However, synthetic formulations often provide advantages in maintaining viscosity stability across extreme temperature ranges.
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