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Despite the lower cost, STP oil remains highly effective because it carries the API (American Petroleum Institute) "starburst" and "donut" certifications, which guarantee that the oil meets the rigorous performance and safety requirements set by automotive manufacturers. While it may have a slightly simpler additive package compared to more expensive competitors—with lower levels of specific friction modifiers like boron or molybdenum—it still provides the necessary lubrication, thermal stability, and detergent properties to protect against engine wear and sludge for standard 5,000 to 7,000-mile drain intervals.
Despite the lower cost, STP oil remains highly effective because it carries the API (American Petroleum Institute) "starburst" and "donut" certifications, which guarantee that the oil meets the rigorous performance and safety requirements set by automotive manufacturers. While it may have a slightly simpler additive package compared to more expensive competitors—with lower levels of specific friction modifiers like boron or molybdenum—it still provides the necessary lubrication, thermal stability, and detergent properties to protect against engine wear and sludge for standard 5,000 to 7,000-mile drain intervals.