Special Considerations for Modern Engines Drivers of newer vehicles, particularly those equipped with direct injection or variable valve timing, should pay close attention to specifications like GM dexos1 or Ford WSS-M2C9xx. The number following the 'W' represents high-temperature viscosity, ensuring a durable protective layer when the engine runs hot.
Understanding SAE Motor Oil API and ILSAC Specifications for Modern Engines
The Science Behind Single-Grade and Multi-Grade Oils Single-grade oils, like SAE 30 or SAE 40, were standard in older engines and perform best within a narrow temperature band. These guidelines specify the exact viscosity and performance specifications, such as API or ILSAC ratings, required to maintain the factory warranty and ensure optimal compatibility with the engine’s design and tolerances.
Decoding the Viscosity Grade on the Label The code printed on the container, such as 5W-30 or 10W-40, provides specific information regarding performance metrics. This dual-rating system ensures the lubricant functions effectively across the entire operational range of a typical driving cycle.
Understanding SAE Motor Oil API and ILSAC Specifications
Conventional: Matching Chemistry to Application The base oil chemistry plays a significant role in how SAE motor oil performs in the real world. Conventional oils are refined from crude oil and provide adequate protection for standard driving conditions and older engine designs.
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