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Car fluids quick-reference

The seven fluids that keep a car running — what each one does, the color it should be, how to check it yourself, and roughly when it's due. Tap any fluid to open the full card.

This is an educational reference, not a diagnosis. Intervals are rough averages — always follow your owner's manual, which lists the exact fluid type and schedule for your car. Anything that affects safety (especially brake fluid and any leak) should be confirmed by a licensed mechanic. Never open a hot cooling system, and don't mix fluid types.

General, plain-language information only — not a substitute for your owner's manual or a professional inspection. The right fluid type, color, and interval vary by make, model, and conditions. Colors fade and darken with use, so color alone isn't a reliable health check. When in doubt, ask a qualified technician.

Wondering what a term on your estimate means? See the auto repair glossary · or check what's due by mileage with the maintenance planner.

GearShift helps repair shops answer, quote, and book customers automatically — and explain services like a fluid flush in plain English so customers say yes with confidence.

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