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How is synthetic formulated compared to regular oil?

Unfortunately, Castrol does not publish any of our formulations. Our additive systems and base oils are proprietary and chosen for performance and suitability first. Castrol uses only the highest quality materials, including synthetic base oils.

Synthetic base fluid is manufactured chemically to possess superior viscosity characteristics at low temperatures, improved thermal and oxidative stability, and reduced volatility. Synthetic stock is created in a laboratory from small molecules which are reacted together to produce bigger “pure” molecules. As a result, the molecular structure of the lubricant can be precisely arranged to meet specific thermal or physical requirements and often exceed manufacturer’s criteria for high performance engines.

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