You Might Be Damaging Your Car: 10 Things Your Mechanic Wishes You Wouldn’t Do

Mechanics see the same issues over and over—small habits that, over time, lead to expensive repairs. With a bit of awareness, many of these problems can be completely avoided.

Ignoring the Check Engine Light

Many drivers see it as just an annoying light rather than a real warning. But it can signal anything from something as simple as a loose gas cap to serious engine trouble. Ignoring it for too long can turn minor issues into major—and costly—repairs. The smart move is to get the car checked right away to avoid unnecessary damage.

Driving with Low Engine Oil

Low oil means poor lubrication, which quickly wears down the engine. Still, many forget to check the level regularly or ignore the warning light. To protect your engine and extend your car’s lifespan, check the oil level at least once a month—especially before longer trips.

Putting Off Oil Changes

Over time, engine oil loses its lubricating and cleaning properties. This leads to the buildup of debris and increased wear in the engine, potentially shortening its life significantly. That’s why it’s crucial to follow the manufacturer’s oil change schedule—and even consider changing it a bit earlier if you frequently drive in city traffic or under tough conditions.

Overloading the Car

Driving with excess weight—whether it’s heavy luggage or a trailer—puts extra strain on the suspension, brakes, and transmission. Many people underestimate how quickly this can lead to wear and damage. It’s important to know your vehicle’s load capacity and stick to it consistently.

Ignoring Strange Noises

Sounds like clunks, rattles, or squeals are rarely random. They’re often early signs of mechanical problems that will only get worse if ignored. Always pay attention to unusual noises and have them checked as soon as possible—they rarely go away on their own.

Waiting Too Long to Replace Brakes

Worn brake pads can quickly damage the rotors, making the repair much more expensive. Many only notice once braking performance drops or stopping distances increase. Regular checks and prompt attention to squealing sounds can make a big difference—for both safety and your wallet.

Using the Wrong Fuel

Filling up with the wrong type of fuel can harm the engine and reduce performance. It often happens with rental cars or newer models with specific requirements that drivers may not be familiar with. If in doubt, always check the fuel cap or the owner’s manual.

Letting the Engine Idle for Too Long

Many still believe idling warms up the engine properly, especially in winter. But modern engines don’t need this—in fact, idling can harm the engine and wastes fuel. The best approach is to start the car and drive gently, letting the engine warm up naturally and efficiently.

Skipping Winter Washes

Winter roads are covered in salt and grime, which quickly accumulate underneath the car and can cause rust—especially on the brakes. Many neglect car washes in cold months, but this is exactly when they’re most important. Regular undercarriage washes can significantly extend the life of critical components.

Neglecting Tire Maintenance

Incorrect tire pressure and lack of rotation lead to uneven wear, compromising both safety and fuel efficiency. Many forget to monitor tire pressure, and few rotate their tires as recommended. A quick monthly check and rotating tires roughly every 10,000 kilometers can make a big difference.