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20 Ways You’re Ruining Your Car and Don't Even Know It

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man having car problems
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Moving Violations

Everyone knows to get their oil changed, to pump the right kind of gas for their vehicle, and not to crash into things whenever it’s avoidable — but you might be killing your car in other, more subtle ways without even realizing it. Here’s a look at the little things that drivers do — and don’t do — on highways across America that make their vehicles perform poorly, break down early, and lose value prematurely.

Related: 32 Lies Your Mechanic Has Told You

Dirty Car
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Riding Dirty

One of the simplest things any driver can do is visit the car wash frequently or bust out the hose, sponge, and bucket, and do it themselves. Clean cars turn heads and dirty cars turn stomachs, but it’s not just aesthetics — car washes extend the life of your car and help hold its value. Caked-on gunk — particularly in the winter when roads are treated with corrosive salt, sand, and melting chemicals — can eventually eat away at your paint. Modern car paints are mixed with protective coatings that repel the elements and protect the vulnerable metal underneath. All it takes is a little breach of that coating to allow water to seep in and rust to form. Once rust takes hold, it spreads like a cancer and slowly devours your vehicle.

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Power Washing Your Car
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Power Washing Your Car

On the other end of the spectrum is washing that’s too intense. According to Consumer Reports, many people cave into the urge to turn their pressure washer — which worked so well on their decks and patios — on their vehicles as an easy way to blast off dirt without resorting to soap, bucket, sponge, and garden hose. They shouldn’t. The power is too intense and can chip paint, which, here, too, can breach your car’s protective coating and invite rust.

Related: 12 Ways to Stop Wasting Money on Your Car

Undercarriage Wash
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Keeping the Out-of-Sight Undercarriage Out of Mind

There’s one exception to the rule about not using a pressure washer, which you can safely use to get the reach and power needed to blast hard-to-reach places on your car’s unpainted, unprotected, and frequently neglected undercarriage. If you pay to get your car washed, the undercarriage should be included. If you DIY, make sure to pay special attention to what you don’t see, as the undercarriage and all its critical components are vulnerable to the grime, gas, oil, dirt, salt, and sand caked to the roadways it rides just a few inches above. If you don’t have a pressure washer, a thorough spray with the hose is better than nothing. If you do, the addition of a degreasing detergent will help even more.

Rear Windshield
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Using Ammonia-Based Cleaner on the Rear Windshield

Ammonia, which is found in many common household glass cleaners, is great at stripping grime and gunk from windows. It’s also, however, powerful enough to degrade those little black stripes on your rear windshield and the adhesives that keep them in place. Those are the mesh grid of your rear defroster, and if they’ve been degraded by ammonia over time, they can’t receive electrical currents. If they can’t receive electrical currents, they can’t heat up. If they can’t heat up, they can’t evaporate condensation. If they can’t evaporate condensation, you can’t see what’s behind you. Ammonia can also degrade window tinting and cause the rubber weather stripping along the edges to dry and crack.

Related: Disinfecting Wipes Will Destroy These Products

Cars in driveways
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Parking Outside

If you have the option of parking under cover, take it, even if it’s not a full-fledged garage. Wind, rain, snow, temperature swings, and powerful UV rays from the sun degrade every surface they touch — awesome geological features like the Grand Canyon were created by those exact same elements. Not only do cars parked under cover avoid all that, but they’re spared bird droppings, falling branches, blowing debris, and the rest of the car-killers lurking outdoors. If you don’t have a garage, carport, or similar covered parking spot, invest in a car cover — you can get a good one for about the price of a tank of gas.

Maintain Proper Tire Pressure
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Not Keeping Your Tires Properly Inflated

Every car comes with a manual that dictates the exact tire pressure that’s appropriate for that vehicle’s tires. Going below can negatively affect both braking and steering response. Underinflation leads to premature wear on the sides of the tire and creates excess flex in the sidewalls, which generates potentially dangerous heat that can lead to blowouts and other tire failures. Too much air and your overpressurized tires are more prone to uneven wear on the center of the tires and make them more vulnerable to bubbles and sidewall damage from curb impacts.

Related: Tire Installation Cost Comparison: What's the Best Place to Get New Tires?

Best Snow Tires
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Driving on the Wrong Tires

For most people in most climates, a good set of all-weather tires will provide enough traction and performance 365 days a year, including when it’s snowy outside. Some truly harsh environments require snow tires, but only during the coldest, snowiest weeks and months. Driving on snow tires all year round dampens performance and quickly wears down their specialized treads. Much more importantly, however, never drive with any size tire not specified in your car’s manual. Driving on tires that are too big, too small, too tall, too thin, or too wide is bad for your car and can be fatally bad for drivers and passengers thanks to the heightened risk of rollovers and all kinds of other dangers.

Related: The Best Cheap All-Season Tires

Pothole
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Hitting Speed Bumps and Potholes at Speed

Roll slowly at a consistent speed over speed bumps and don’t roll over potholes at all. That, of course, is easier said than done, but it’s still important to take both common hazards seriously. If not, your tires and suspension will be sure to make you pay. The jarring caused by potholes, speedbumps, and similar obstacles compresses the suspension as it struggles to absorb the impact. Even more likely is tire damage and don’t be surprised if your alignment is off after you hit one at high speeds.

Related: 20 States With the Worst Roads (and 5 With the Best)

Check Engine Light
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Ignoring Your Check Engine Light

Few things are more foreboding than seeing the check engine light pop on in front of you as you cruise down the highway, but plenty of drivers ignore it because they don’t notice any difference in the way their car is performing. While it’s true that it might just be a computer/electrical glitch, the check engine light usually does what it was designed to do: warn drivers that something is seriously wrong with the car and whether they realize it or not, the car is experiencing some kind of mechanical failure. When the light goes on, call your mechanic without delay.

Dashboard Symbols
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Turning a Blind Eye to Other Dashboard Symbols

The check engine light is the 800-pound gorilla on the block, but don’t think you can get away for very long with turning a blind eye to any other common dashboard warning lights. They let you know about problems with a wide variety of systems. There are icons that warn about problems with traction control, airbags, and automatic shift start. Then there’s the oil pressure light, the tire pressure warning light, the engine temperature warning light, and, of course, the dreaded low fuel indicator.

Related: How Often You Really Need to Take Your Car in for Service

Gas station sign
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Running on Fumes

The arrival of the fuel light triggers highway anxiety, but driving with a near-empty fuel tank isn’t bad only for your state of mind — it’s bad for your fuel pump. Located inside the gas tank, the fuel pump must be submerged to work properly, which is only possible when your tank is roughly one-quarter of the way full or more. An exposed pump can cause temperatures to rise by allowing the pump to pull in air and become clogged by the sediment that is commonly found at the bottom of the gas tank.

Related: 10 Most Expensive Car Problems and How to Avoid Them

Pumping Gas
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Topping Off Your Tank

When you’re fueling up at the gas station, the automatic shutoff mechanism makes the trigger on the nozzle click off when you’re all filled up. Once that happens, there’s no way to get more usable gas in the tank. When cash was king, it was common for people to “top it off” with a few gentle squeezes to round up the price to the nearest dollar to avoid getting saddled with a pocket full of change. It was a bad idea then, and it’s a bad idea now. That excess fuel goes not into the gas tank, but into the evaporation canister, which restricts fuel vapor from being released into the air. It’s both a safety feature and an environmental feature that will eventually fail if it’s constantly flooded with gas, which it is every time you overfill at the pump.

Related: 20 Ways to Get Better Gas Mileage

Auto mechanic replacing car battery
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Buying the Cheapest Replacement Battery

There are definitely times when you can save money by cutting corners with your car. Your battery is not one of those times. When your battery goes and it’s time to install a new one — which is a DIYable project, for many — get a good one, or you’ll be back for another bad one before you know it. Cheap car batteries are built with cheap materials, like low-end cables and wires and PVC instead of rubber as a separating material. Cheap batteries also sweat acid, which triggers a chemical reaction that creates corrosion and leads to a bunch of toxic gunk building up on the outside of the cable ends and, eventually, the cables themselves.

Related: Cheapest Auto Parts Store: AutoZone vs. Advance Auto vs. O'Reilly vs. Napa

Jamie's Car
Jamie's Car by Kevin Jarrett (CC BY)

Letting Your Car Live a Sedentary Lifestyle

If you’re one of the many COVID-19 quarantiners who recently began working from home and ordering everything you buy online, your car might be spending a lot of time sitting unused. That’s great in that you’re not buying gas or putting miles on your ride, but bad because, like you, sitting idle for extended periods of time is bad for your car. Even if you don’t need to go anywhere, drive your car around the block a few times once every few weeks to get motor oil circulating through the engine. Sitting in place for too long can lead to flat spots on tires, damage from pests, dried out belts and hoses, and the buildup of rust. Perhaps most immediately is your battery, which must be replenished by your car’s alternator every so often, or else it will go dead in a few months instead of a few years.

Related: 11 Things to Do to Maintain Your Car While You're Not Driving It

Fixing It Up
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Ignoring Windshield Cracks

Cracked windshields are ugly, but they’re also unsafe. Small cracks don’t stay small for long — get them patched before they spiderweb out until the entire windshield has to be replaced. Cracks disrupt your vision and, if they’re really bad, can reduce roof support and even cause airbags to malfunction.

New cars in lot
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Ignoring Recall Notices

Automakers issue recalls when they realize the presence of a defect that could compromise safety. In other cases, the National Highway Traffic Safety Administration (NHTSA) orders a recall. Either way, a recall means that your car might contain a part, system, or even a software code that could diminish your vehicle’s functionality or even make it unsafe to drive. Just type your vehicle’s vehicle identification number (VIN) into the NHTSA recall database to find out if you’re driving a vehicle with a recalled part, and check back regularly to make sure you’re up to date.

Eating In Car
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Asking Your Car to Double as a Diner

Even the most prudent motorists are going to stuff their faces while driving here and there during moments of weakness. But when eating in your car — and allowing your passengers to do the same — is the rule and not the exception, the dropped salt, grease, crumbs, seeds, smears, and smudges begin to add up. The result is a layer of matted, caked-on grossness in your seats, mats, carpeting, upholstery, and all things touched that eventually grows resistant even to thorough cleanings.

Related: 14 Important Things to Consider When Selling a Used Car

dirty car windshield
Denis Torkhov/istockphoto

Smoking While You Drive

Lighting up does the same thing to your car that it does to you: Makes it smell bad, makes it ugly, makes it age prematurely, and poisons it slowly from the inside out. You know right away when you’re in a smoker’s car because that smoke contains gross, sticky, tarry resin that clings to everything from vinyl to glass — windshields shouldn’t have a sepia tint like Old West photos — and it doesn’t let go. It embeds itself in the carpeting and the upholstery to a point of permanence and smokers will inevitably leave burns from missed flicks and crumbling cherries. According to the National Institutes of Health, smokers get far less for their cars at resale than comparable nonsmokers with almost no exceptions.

Related: 12 Cheap Ways to Rid Your Ride of Nasty Odors

dog traveling in a car with head out window
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Bringing Pets Along For the Ride

This is a tough one because people love their pooches and parrots and puppies, but they’re all terrible for your car. Some scratch, gnaw, drool, and relieve themselves. But even those with impeccable travel manners shed hair and dander, which creates smells, triggers allergies, and becomes embedded in fabrics, upholstery, and carpeting. Don’t fret, however. From seat covers to specialized mats, there are plenty of ways to pet-proof your car.

Car Repair
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Letting Your Uncle Do Repair Work

When something goes wrong with your car, which it will, you might receive offers to make repairs on the cheap from friends or acquaintances who are “good with cars.” In the long run, you’ll almost never save money this way. Universally recognized standards like the National Institute for Automotive Service Excellence ASE certification ensures you’re trusting your vehicle to service pros who participate in continuing education, are up-to-date on emerging technologies and techniques, and who are invested in their reputations and careers.

Related: 18 Car Expenses That Are Really Worth the Money