What Is the 30-60-90 Rule for Cars?

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The 30-60-90 rule is a general car maintenance schedule based on mileage intervals. At 30,000 miles, you should replace the air filter, fuel filter, and transmission fluid, plus inspect brakes and tires. At 60,000 miles, add spark plug replacement, brake pad service, and coolant flush to the list. At 90,000 miles, perform major services including timing belt replacement (if applicable), water pump inspection, and comprehensive fluid changes. This rule helps prevent common causes of engine failure. Browse our maintenance guides for detailed service information. Use our fuel efficiency calculator to track your vehicle's health between services.