Car Maintenance Schedule: What to Check Monthly, Every 6 Months and by Mileage

Vehicle owners searching for a maintenance schedule usually want one answer: how often does each part of the car need attention? There is no single universal number, because manufacturers set their own intervals in the owner's manual for each model. But roadside-assistance organisation AAA, tire maker Michelin, and the U.S. Department of Energy's FuelEconomy.gov program each publish general guidance that overlaps closely, giving a usable baseline for most passenger vehicles.

Monthly checks

AAA recommends checking the engine oil level with the dipstick every month, making sure it falls between the minimum and maximum markers. Tire pressure should also be checked monthly, according to both AAA and Michelin, and only when the tires are "cold" — meaning the vehicle has been parked for at least three hours, AAA notes. The correct pressure is printed on a sticker in the driver's-side door jamb. Michelin adds that tires lose roughly one pound per square inch (PSI) of pressure per month naturally, which is why the check needs to be repeated regularly. Tire tread condition should be monitored on the same monthly cycle, per AAA.

Every two to six months

AAA's schedule calls for inspecting exterior lights — headlights, turn signals, brake lights, fog lights and the license-plate light — along with wiper blades and windshield washer fluid every two to three months. At the six-month mark, AAA recommends checking coolant levels when the engine is cool, inspecting battery terminals for corrosion and confirming cables are secure, and cleaning the vehicle's exterior and interior to prevent rust and paint damage.

Mileage-based service

Tire rotation is where the sources differ slightly on the exact number but agree on the range: AAA puts tire rotation and a brake inspection together at every 6,000–8,000 miles, while Michelin independently recommends rotating tires every 6,000 to 8,000 miles as well, to even out front-to-rear wear. AAA separately lists oil changes and a check of all fluid levels — coolant, brake fluid, transmission fluid and power steering fluid — at every 5,000 miles. FuelEconomy.gov, run by the U.S. Environmental Protection Agency and Department of Energy, stresses using the oil grade the manufacturer specifies, since using a heavier oil than recommended can lower fuel economy, and notes that oil carrying the "Energy Conserving" label on the API symbol contains friction-reducing additives.

Tire pressure and fuel economy

Beyond safety, tire and engine maintenance affects running costs. FuelEconomy.gov states that keeping tires properly inflated improves fuel economy by an average of 0.6%, and by as much as 3% in some vehicles, while every 1-PSI drop in average pressure across all tires cuts fuel economy by about 0.2%. The site also notes that for modern fuel-injected or diesel engines, replacing a clogged air filter mainly restores acceleration rather than fuel economy; it is older carbureted engines that see a measurable mileage benefit from a filter change, "a few percent" according to the same source.

Why the owner's manual still matters

All three sources used for this guide frame their numbers as general starting points, not a replacement for manufacturer guidance. AAA's own schedule tells drivers to consult the owner's manual when a warning light appears. FuelEconomy.gov likewise directs drivers to the manufacturer's recommended oil grade rather than a fixed mileage number, since that grade varies by engine design.

• Check oil level and tire pressure monthly, using the door-jamb sticker for correct PSI.
• Inspect lights, wipers and washer fluid every two to three months.
• Check coolant and battery terminals around every six months.
• Plan tire rotation and a brake check together, roughly every 6,000–8,000 miles.
• Use the oil grade and change interval specified in the owner's manual for the exact vehicle.