Taking your car to the mechanic is a necessary evil. But paying a professional £60/$80 an hour just to top up your windshield washer fluid or change your engine air filter? That’s just throwing money away.
Modern cars are incredibly complex, packed with computers, sensors, and tightly packed engine bays. But despite all that technology, the basic, foundational maintenance of your vehicle is still surprisingly accessible. You don’t need to know how to rebuild a transmission or reprogram an ECU to keep your car running beautifully.
By mastering just a few basic DIY skills, you can save hundreds of dollars a year, extend the life of your vehicle, and avoid being stranded at the side of the road.
Here are the 15 essential DIY car maintenance tasks every driver should know how to do.
🛢️ Fluids & Filters: The Lifeblood of Your Car
1. Check Your Engine Oil Level
Why it matters: Oil is the lifeblood of your engine. Running it low will destroy it in minutes. How to do it: Park on level ground and turn the engine off (wait a few minutes if it was just running). Pull the dipstick, wipe it clean with a rag, reinsert it fully, and pull it out again. The oil level should be between the “MIN” and “MAX” marks (or within the crosshatched area). Check it once a month.
2. Top Up Engine Oil
Why it matters: Engines naturally consume a tiny amount of oil over time. Topping it up prevents engine wear. How to do it: Check your owner’s manual or the oil cap for the correct viscosity (e.g., 0W-20 or 5W-30). Remove the oil filler cap on top of the engine, insert a funnel, and pour in a small amount (half a quart/litre). Wait a minute, check the dipstick, and repeat until it’s in the safe zone. Never overfill past the MAX line.
3. Check and Top Up Windshield Washer Fluid
Why it matters: A clean windshield is your primary safety feature. How to do it: Pop the hood and look for the reservoir cap (usually blue and marked with a windshield/water symbol). Pop it off and fill it to the top with dedicated washer fluid. Pro tip: Never use plain water. It doesn’t clean bugs off, and it will freeze and crack the reservoir in winter.
4. Check Coolant Levels (Safely!)
Why it matters: Coolant prevents your engine from overheating and freezing. How to do it: CRITICAL SAFETY RULE: Never open the radiator cap when the engine is hot. You risk severe burns from pressurized boiling liquid. Instead, locate the translucent coolant reservoir (usually a pink or green liquid) and check if the level is between the “MIN” and “MAX” lines when the engine is cold. If it’s low, top it up with the exact type of coolant specified in your manual.
5. Check Brake Fluid
Why it matters: Brake fluid transfers the force from your pedal to the brake pads. How to do it: Locate the brake fluid reservoir (usually near the driver’s side firewall). Check the level against the MIN/MAX lines. Note: Brake fluid doesn’t just “disappear.” If it’s consistently low, it means your brake pads are worn down (the fluid drops as the calipers extend) or you have a leak. If it’s low, get your brakes inspected.
6. Replace the Engine Air Filter
Why it matters: A clogged engine air filter restricts airflow, reducing fuel economy and engine performance. How to do it: Locate the black plastic box near the front of the engine bay. Unclip the metal clasps or remove the screws. Lift the lid, take out the old, dirty rectangular filter, note which way it was facing, and drop the new one in. Snap the box shut. Takes 3 minutes, saves you $40 at the shop.
7. Replace the Cabin Air Filter
Why it matters: This filter cleans the air coming through your AC and heater. A dirty one means weak airflow and a car that smells like old socks. How to do it: Usually located behind the glovebox. Drop the glovebox down (there are usually tabs on the sides to release it), unclip the rectangular plastic cover, pull out the old filter, and slide the new one in. Check your owner’s manual for your specific car’s location.
🛞 Tires & Rubber: Keeping You on the Road
8. Check and Adjust Tire Pressure
Why it matters: Under-inflated tires ruin fuel economy, wear out prematurely, and can blow out. How to do it: Buy a cheap digital tire pressure gauge. Check the tires when they are cold (driven less than 2 miles). Look at the sticker inside the driver’s door jamb for the correct PSI (do not use the number printed on the tire sidewall). Unscrew the valve cap, press the gauge on, and add air at a petrol station or with a portable compressor until it matches the door jamb number.
9. Check Tire Tread Depth
Why it matters: Bald tires hydroplane in the rain and take forever to stop. How to do it: Look for the “wear bars”—small raised rubber bridges between the tread grooves. If the tread is flush with these bars, your tires are legally bald and need replacing. Alternatively, use the coin test: insert a coin into the tread. If you can see the top of the coin’s design, you need new tires.
10. Change a Flat Tire
Why it matters: It’s the ultimate rite of passage. You need to know how to do this before you get stranded. How to do it:
- Park on flat, solid ground and apply the parking brake.
- Loosen the lug nuts on the flat tire just a half-turn (don’t remove them yet).
- Position the jack under the vehicle’s reinforced pinch weld (check the manual) and lift the car until the tire clears the ground.
- Remove the lug nuts and swap the flat for the spare.
- Hand-tighten the lug nuts as much as possible.
- Lower the car to the ground, then tighten the nuts in a “star” pattern to ensure it sits flush.
👀 Visibility & Electrical: Seeing and Being Seen
11. Replace Wiper Blades
Why it matters: Streaking wipers blind you in the rain. How to do it: Lift the wiper arm away from the glass. Look at how the blade attaches to the metal hook. Most modern cars use a “pinch-tab” system: pinch the two plastic tabs on the side of the blade, slide it down the hook, and pull it off. Slide the new blade on until it clicks. Pro tip: Put a towel on the windshield before you lift the wiper arm; if the arm slips, it will shatter your glass.
12. Clean Battery Terminals
Why it matters: Corrosion (that crusty white/blue powder) blocks electricity, leading to slow cranking or a no-start. How to do it: Disconnect the negative (black) cable first, then the positive (red). Mix a tablespoon of baking soda with a little water. Dip an old toothbrush or a wire brush into the mix and scrub the battery posts and the inside of the cable clamps until they are shiny. Rinse with a little clean water, dry, reconnect positive first, then negative, and smear a little petroleum jelly on the terminals to prevent future corrosion.
13. Check All Exterior Lights
Why it matters: You can’t see your own brake lights or reverse lights. Driving with a blown bulb is dangerous and illegal. How to do it: Do a “walk-around” once a month. Turn on the headlights, check the high beams, and check the parking lights. Turn on the hazards to check the indicators. Have a friend stand behind the car while you press the brake pedal and shift into reverse. If a bulb is out, check your manual to see if it’s a simple bulb swap or requires a dealer visit (common with modern sealed LED units).
14. Locate and Replace a Blown Fuse
Why it matters: If your radio, power window, or cigarette lighter suddenly stops working, it’s usually a $1 fuse, not a broken motor. How to do it: Find the fuse box (usually under the dash or in the engine bay; check the manual). Use the diagram on the inside of the fuse box cover to find the specific fuse for the broken component. Pull it out using the plastic tweezers provided in the box. Hold it up to the light. If the metal wire inside the plastic is broken or melted, it’s blown. Push a new fuse of the exact same amperage (color-coded) into the slot.
🚨 Emergency Prep
15. Jump-Start a Car Safely
Why it matters: Batteries die. Knowing how to safely jump-start your car (or help a stranger) is an essential life skill. How to do it: Park the donor car close, but not touching. Turn both cars off.
- Connect Red clamp to the Positive (+) terminal of the Dead battery.
- Connect the other Red clamp to the Positive (+) terminal of the Good battery.
- Connect Black clamp to the Negative (-) terminal of the Good battery.
- Connect the other Black clamp to an unpainted metal surface on the dead car’s engine block (like a bare bolt). Do not connect it to the dead battery’s negative terminal, as it can spark and ignite battery gases.
- Start the donor car, wait 2 minutes, then start the dead car.
- Remove the cables in the exact reverse order. Drive the rescued car for at least 20 minutes to recharge the battery.
🛑 The Golden Rule: Know Your Limits
DIY maintenance is empowering and cost-effective, but knowing when to stop is just as important as knowing how to start.
Call a professional if:
- You smell burning rubber or sweet syrup (coolant).
- You see fluid pooling under the car that isn’t clear water from the AC drain.
- The brake pedal feels spongy or goes to the floor.
- You hear loud grinding, knocking, or squealing from the engine or wheels.
- A dashboard warning light flashes or stays illuminated (especially the red oil pressure or temperature lights).
Take Ownership of Your Machine
Cars are expensive. The best way to protect your investment is to understand how it works on a basic level. You don’t need a garage full of power tools to be a proactive car owner. A $10 digital tire gauge, a $5 funnel, a pack of microfiber cloths, and a can-do attitude will save you hundreds of dollars over the life of your vehicle.
Start with the easiest tasks this weekend. Check your tire pressure. Top up your washer fluid. Look at your engine air filter. Once you realize how simple it is, you’ll never look at your car—or your mechanic’s bill—the same way again.
