Guide
Synthetic vs. Conventional Oil
Why synthetics exist, when they’re worth the money, and how to decide what to use.
Reviewed by Michael Koster · Updated April 2026
What is synthetic oil?
- Synthetic oil is engineered for better stability at high and low temperatures.
- It resists breakdown longer than conventional oil, which can mean cleaner internals and better protection.
When synthetic makes sense
- Turbocharged engines, high-performance cars, and engines that see extreme temperatures often benefit most.
- If your owner’s manual specifies synthetic, stick with it.
Mixing and switching oils
- You can generally switch between conventional and synthetic as long as the viscosity and specs meet the manual.
- Mixing small amounts is not catastrophic, but for best results use one type consistently.
Look up specs for popular vehicles
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