Car Maintenance Guides
Practical, sourced car-care guides from the CarO team. Every guide starts with a quick answer, cites sources such as AAA, NHTSA, FuelEconomy.gov, the IRS and GOV.UK, and shows when it was last updated.
Components
Air Filter Replacement Guide
When to replace the engine air filter and the cabin air filter, how to check them, typical intervals, and how easy each is to do yourself.
Components
Brake Fluid Change: How Often and Why
How often to change brake fluid (often every 2-3 years), why it absorbs moisture, signs it's due, and what a brake fluid flush involves.
Components
Car Battery Life: How Long Does a Battery Last?
How long a car battery lasts (typically 3-5 years), what shortens battery life, warning signs of a failing battery and when to test or replace.
Records & costs
How to Track Car Expenses
How to track car expenses: the categories to record, monthly and per-mile totals, receipts for taxes, and tools from spreadsheets to apps.
Maintenance basics
Car Inspection Checklist
A car inspection checklist to help you pass a state safety inspection or UK MOT: lights, tires, brakes, wipers, mirrors, emissions and warning lights.
Maintenance basics
Car Maintenance Checklist (Printable)
A complete car maintenance checklist by frequency: monthly checks, every oil change, every 6 months and yearly, plus a printable version.
Maintenance basics
Car Maintenance for Beginners
Car maintenance for beginners: the 12 basics every driver should know, what you can do yourself, what to leave to a shop and how to avoid overpaying.
Records & costs
Car Service History: Why It Matters
What a car service history is, why it affects value and warranty, how to check one when buying used, and how to build your own.
Components
Coolant Flush: How Often to Change Coolant
How often to change coolant or antifreeze, what a coolant flush involves, signs of low or old coolant, and how to check the level safely.
Maintenance basics
Electric Car Maintenance: What EVs Need
Electric car maintenance explained: what EVs still need (tires, brakes, cabin filter, coolant), what they don't, and how running costs compare.
Fleet
Fleet Maintenance Schedule for Small Fleets
How to build a fleet maintenance schedule for a small business: preventive maintenance intervals, inspections, records and choosing software.
Fuel
How to Keep a Fuel Log
How to keep a fuel log: what to record at each fill-up, how to calculate economy and cost per mile, paper vs app, and what the numbers tell you.
Maintenance basics
High-Mileage Car Maintenance Guide
High mileage car maintenance after 100,000 miles: what to check, which fluids and parts to replace, warning signs and when repairs stop making sense.
Oil
How Often to Change Oil: Miles and Months
How often to change oil in 2026: typical intervals for conventional and synthetic oil, severe driving, time limits, and why 3,000 miles is outdated.
Maintenance basics
How Often to Service a Car
How often to service a car: typical intervals for minor and major services, how time limits work, and how to read your manual's schedule.
Fuel
How to Calculate MPG (Step by Step)
How to calculate MPG with the full-tank method, plus km/L and L/100km, common mistakes, and why your result differs from the EPA sticker.
Oil
How to Check Oil Level in 6 Steps
How to check oil level on a dipstick in six steps, what the marks mean, what the oil colour tells you, and what to do if it's low.
Fuel
How to Improve Fuel Economy
How to improve fuel economy with 12 tips backed by FuelEconomy.gov: smoother driving, speed, tire pressure, weight, roof racks, idling and maintenance.
Records & costs
How to Keep Track of Car Maintenance
How to keep track of car maintenance: what to record, paper vs spreadsheet vs app, reminders, and a simple routine that takes two minutes per service.
Mileage & taxes
IRS Mileage Rate 2026
The IRS mileage rate for 2026: 72.5 cents per business mile Jan-Jun and 76 cents from July 1, plus medical, moving and charity rates, and how to use them.
Mileage & taxes
Mileage Log for Taxes: What the IRS Requires
How to keep a mileage log for taxes: what the IRS requires, what counts as business miles, standard vs actual expenses, and common mistakes.
Maintenance basics
New Car Maintenance Schedule
What a new car needs in its first three years: first oil change, break-in, free maintenance plans, warranty records and the services that matter.
Oil
Oil Change Light: What It Means
What the oil change light (maintenance required light) means, how it differs from the red oil pressure warning, and how to reset it after a service.
Maintenance basics
Seasonal Car Maintenance Checklist
Seasonal car maintenance for winter and summer: battery, tires, coolant, wipers, AC and an emergency kit, with a checklist for each season.
Oil
7 Signs You Need an Oil Change
Seven signs you need an oil change: dashboard alerts, dark or gritty oil, low level, engine noise, burning smell, exhaust smoke and overdue mileage.
Components
Spark Plug Replacement: When and Signs
When to replace spark plugs (copper ~30,000 mi, iridium often 60,000-120,000), signs of worn plugs, and whether it's a DIY job.
Oil
Synthetic vs Conventional Oil
Synthetic vs conventional oil compared: protection, change intervals, cost, and when your car needs synthetic. Plus what blends and high-mileage oils are.
Components
Timing Belt Replacement: When It's Due
When to replace a timing belt (often 60,000-105,000 miles), belt vs chain, interference engines, warning signs and what else to replace at the same time.
Components
Tire Rotation Schedule
Tire rotation schedule: how often to rotate (often every 5,000-8,000 miles), rotation patterns for FWD, RWD and AWD, and why it matters.
Components
Transmission Fluid Change: When and Why
When to change transmission fluid (often 30,000-60,000 miles or 'lifetime'), signs of bad fluid, drain-and-fill vs flush, and manual vs automatic.
Mileage & taxes
Uber Driver Expenses: What to Track
Uber and rideshare driver expenses: the costs to track, mileage vs actual expenses, records the IRS expects, and how to see your real profit per mile.
Records & costs
Used Car Checklist
A used car checklist for buyers: documents, history and recall checks, an exterior and interior walk-round, a test drive and a pre-purchase inspection.
Components
Wheel Alignment: Signs You Need One
Wheel alignment explained: signs you need one, how often to check, alignment vs balancing, and how it affects tire wear and fuel economy.
Components
When to Replace Brake Pads
When to replace brake pads: typical mileage, minimum thickness, squealing and grinding, and how driving style changes pad life.
Components
When to Replace Tires
When to replace tires: tread depth (2/32 inch or 1.6 mm), the penny test, tire age (6-10 years), damage signs and how to make tires last.
Components
Wiper Blade Replacement: When and How
When to replace wiper blades (often every 6-12 months), signs they're worn, how to choose the right size and how to fit them in minutes.
Maintenance basics
- Car Inspection Checklist
- Car Maintenance Checklist (Printable)
- Car Maintenance for Beginners
- Electric Car Maintenance: What EVs Need
- High-Mileage Car Maintenance Guide
- How Often to Service a Car
- New Car Maintenance Schedule
- Seasonal Car Maintenance Checklist
Oil
- How Often to Change Oil: Miles and Months
- How to Check Oil Level in 6 Steps
- Oil Change Light: What It Means
- 7 Signs You Need an Oil Change
- Synthetic vs Conventional Oil
Components
- Air Filter Replacement Guide
- Brake Fluid Change: How Often and Why
- Car Battery Life: How Long Does a Battery Last?
- Coolant Flush: How Often to Change Coolant
- Spark Plug Replacement: When and Signs
- Timing Belt Replacement: When It's Due
- Tire Rotation Schedule
- Transmission Fluid Change: When and Why
- Wheel Alignment: Signs You Need One
- When to Replace Brake Pads
- When to Replace Tires
- Wiper Blade Replacement: When and How
Fuel
Records & costs
- How to Track Car Expenses
- Car Service History: Why It Matters
- How to Keep Track of Car Maintenance
- Used Car Checklist
Mileage & taxes
- IRS Mileage Rate 2026
- Mileage Log for Taxes: What the IRS Requires
- Uber Driver Expenses: What to Track
Fleet
Schedules and warning lights
Free tools
See all free car tools.
Track this in CarO
CarO is a free car maintenance tracker app for iPhone and Android that keeps a full service history, reminds you about oil changes and inspections by mileage or date, and logs fuel fill-ups with MPG, odometer readings and car expenses for every vehicle you own. Logs are stored in the cloud and can be exported as CSV.
