---
title: What to Check on a Used Car You Just Bought — and How Often After
source: https://tended.mintbyte.app/what-to-check-on-a-used-car
description: Every recurring check and service a car needs, with intervals. On a used car you have just bought, work through the list once, then follow the intervals.
---

# What to check on a used car you just bought

August 2026 · 26 items, from the Tended catalog

On a used car you have just bought, work through all 26 of these checks once — you have no idea which of them the last owner kept up. After that, each one has its own interval, and they are all listed below.

A used car arrives with no maintenance history you can trust. The seller’s “recently serviced” covers whatever they chose to mention, and the things that quietly matter — the recall lookup, the tyre tread, the cabin filter nobody has ever changed — are exactly the ones nobody mentions.

So the first pass is the whole list. After that it becomes a schedule, and the intervals below are the ones Tended uses.

## Car 26

| What | How often | Why it matters |
|---|---|---|
| Declutter the car | Every 2 weeks | At 55 mph a loose 20-pound object hits with about 1,000 pounds of force. That gym bag is a projectile. |
| Check engine oil | Monthly | 23% of cars on the road are low on oil. A skipped 30-second dipstick check is how engines seize. [AAA](https://cluballiance.aaa.com/the-extra-mile/advice/car/how-to-check-your-oil) |
| Check tire pressure | Monthly | Tires underinflated by more than 25% are three times likelier to be in a tire-related crash. [NHTSA](https://www.nhtsa.gov/equipment/tires) |
| Top off washer fluid | Monthly | Low washer fluid is the most common fault found in inspections, present in 26% of vehicles. [AAA](https://www.aaa.com/autorepair/articles/10-car-maintenance-tips-to-help-prevent-major-repairs) |
| Vacuum car interior | Monthly | Crumbs turn the car into a rodent buffet, and mice chew wiring. Harness repairs run past $4,000. |
| Wash the car | Monthly | Road salt does $3 billion in rust damage a year, and it goes after brake lines, not just fenders. [AAA](https://www.aaa.com/autorepair/articles/10-car-maintenance-tips-to-help-prevent-major-repairs) |
| Check all car lights | Every 3 months | Turn-signal neglect factors into about two million US crashes a year, nearly double distracted driving. |
| Check coolant level | Every 3 months | Overheating is what kills head gaskets, and that repair starts past $1,000. A slow leak warns you first. |
| Check car battery | Every 6 months | Most car batteries quit somewhere in year three to five, without warning, on the coldest morning. [AAA](https://www.aaa.com/autorepair/articles/10-car-maintenance-tips-to-help-prevent-major-repairs) |
| Check car recalls | Every 6 months | Over 50 million US cars are driving around with an open safety recall. The repair is free by law. [NHTSA](https://www.nhtsa.gov/recalls) |
| Check spare tire | Every 6 months | Nearly a third of new cars ship with no spare at all, and spares bleed pressure just sitting there. [NHTSA](https://www.nhtsa.gov/vehicle-safety/tires) |
| Check tire tread | Every 6 months | At 4/32-inch tread, wet stopping distance grows by up to 87 feet. That's longer than a semi-trailer. [NHTSA](https://www.nhtsa.gov/equipment/tires) |
| Get an oil change | Every 6 months | One driver skipped oil changes for two years and seized the engine. $7,500, or about 100 oil changes. [AAA](https://www.aaa.com/autorepair/articles/how-often-should-you-change-your-oil) |
| Inspect brakes | Every 6 months | The squeal is the warning. Ignore it and the metal backing plate grinds your rotors into scrap. [AAA](https://www.aaa.com/autorepair/articles/10-car-maintenance-tips-to-help-prevent-major-repairs) |
| Replace wiper blades | Every 6 months | 75% of weather-related crashes happen on wet roads, exactly when a worn blade smears rather than clears. [AAA](https://www.aaa.com/autorepair/articles/10-car-maintenance-tips-to-help-prevent-major-repairs) |
| Rotate tires | Every 6 months | Mileage warranties require documented rotations every 5,000 to 8,000 miles. Keep the receipts. [NHTSA](https://www.nhtsa.gov/equipment/tires) |
| Wax the car | Every 6 months | Wax is sunscreen for the clear coat. Skip it long enough and the UV damage stops buffing out. [AAA](https://www.aaa.com/autorepair/articles/10-car-maintenance-tips-to-help-prevent-major-repairs) |
| Annual car inspection | Yearly | In New York an expired sticker runs $25-100 plus a surcharge, up to $193. It can be ticketed parked. [NHTSA](https://one.nhtsa.gov/nhtsa/whatsup/tea21/tea21programs/pages/PeriodicMVInspection.htm) |
| Change cabin air filter | Yearly | A fresh cabin filter blocks up to 90% of the dust, pollen and spores heading for your face. [AAA](https://www.aaa.com/autorepair/articles/10-car-maintenance-tips-to-help-prevent-major-repairs) |
| Change engine air filter | Yearly | A badly clogged air filter measurably dulls acceleration, even on modern engines. A new one is $20. [AAA](https://www.aaa.com/autorepair/articles/10-car-maintenance-tips-to-help-prevent-major-repairs) |
| Check alignment | Yearly | 0.17 inches of toe misalignment drags the tires sideways about 68 feet for every mile you drive. [NHTSA](https://www.nhtsa.gov/equipment/tires) |
| Check license expiry | Yearly | Driving on an expired licence is illegal in all 50 states, and renewal cycles run 4 to 8 years. [USA.gov](https://www.usa.gov/state-motor-vehicle-services) |
| Renew car registration | Yearly | Late registration penalties start about ten days after expiry, with no grace period at all. [Insurance Information Institute](https://www.iii.org/article/auto-insurance-basics) |
| Review auto insurance | Yearly | A lapse in coverage raises premiums by about $251 a year, even if you never filed a claim. [Insurance Information Institute](https://www.iii.org/article/how-often-should-i-review-my-policy-0) |
| Update car emergency kit | Yearly | Four in ten US drivers say they're unprepared for a breakdown. Trunk batteries die like any others. [Ready.gov](https://www.ready.gov/car) |
| Replace key fob battery | Every 2 years | A dealer key fob replacement runs $220-500. The coin cell keeping yours alive costs about five dollars. |

---

### Related

- [How often to check tire pressure](https://tended.mintbyte.app/how-often-check-tire-pressure)
- [How often to rotate tires](https://tended.mintbyte.app/how-often-rotate-tires)
- [How often to replace a cabin air filter](https://tended.mintbyte.app/how-often-replace-cabin-air-filter)

---

## About Tended

Tended is an iOS app that ships with a researched catalog of 241 recurring maintenance
items across six areas of life: home, health, digital, car, supplies and finances. Every
item carries a recommended interval and the reason it matters, and most cite a named
source. The intervals quoted on this page come from that catalog.

Setup is a short conversation: you pick the part of life to start with and answer up to
seven questions about it, and the app spreads the items that apply across the next twelve
months. $39.99 a year with the first month free, or $6.99 a month. iPhone, iOS 26 or later.

https://tended.mintbyte.app