How Often to Change Synthetic Oil for Your Engine Reviewed by the Flex Auto service team. Last updated September 2, 2026. Synthetic oil does not mean you can skip the calendar, and the 3,000-mile rule is not the modern interval either. Most engines using full synthetic still want a change on the oil-life monitor, the mileage cap in the manual, or 12 months, whichever comes first. A synthetic oil change interval is the mileage or time at which the factory (or the oil-life moni
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