7 Most Common Car Maintenance Myths You Should Stop Believing
You may think you’re taking great care of your car, but if you’re following outdated advice, you might be doing more harm than good. From oil changes to tire pressure, there’s a ton of misinformation that gets passed around—some of it leftover from decades ago. These myths not only waste your money but can actually reduce your car’s performance and lifespan. It’s time to separate fact from fiction and help your car run smoother, longer, and smarter. Here’s a look at seven of the most common car maintenance myths you should stop believing today.
1. You Need to Change Your Oil Every 3,000 Miles
This is perhaps the most widespread and persistent myth in car maintenance. While this used to be true decades ago, modern engines and synthetic oils have changed the game. Most cars today can go 5,000 to 7,500 miles—or even more—between oil changes. Still, quick-lube shops often push the outdated 3,000-mile rule because it means more business for them. Always check your owner’s manual and trust the manufacturer’s recommendation over old-school advice.
2. Premium Gas Will Make Your Car Run Better
It sounds logical—higher price, better performance, right? Not necessarily. Unless your vehicle specifically calls for premium fuel, using it won’t provide any noticeable benefits in horsepower or fuel efficiency. In fact, premium gas can actually be less efficient in engines designed for regular fuel. This is one of those car maintenance myths that hits your wallet more than your engine.
3. Letting Your Car Warm Up Is Good in Cold Weather
This one has been passed down from grandparents to parents to new drivers, but it’s outdated. Modern fuel-injected engines don’t need to sit idling in the driveway before driving. In fact, idling too long in cold weather wastes fuel and increases engine wear. The best way to warm up your engine is to simply start driving gently. So forget the 10-minute warm-up routine—it’s costing you gas for no reason.
4. You Must Use the Dealership for All Maintenance or You’ll Void the Warranty
Many car owners fear they’ll void their warranty by going anywhere other than the dealership for repairs. But federal law says you can service your car at any qualified repair shop without voiding the warranty—as long as the work is done properly. Just keep good records and receipts in case you ever need to show proof. Dealerships often charge more than independent mechanics for the same work. Don’t fall for this car maintenance myth—it limits your options and your budget.
5. A Dead Battery Means You Need a New One Immediately
If your car doesn’t start, it doesn’t always mean your battery is toast. It could be a loose terminal, corrosion, or even a drained charge from accidentally leaving your lights on. Most auto parts stores will test your battery for free to see if it’s still holding a charge. In many cases, a jump-start and a thorough inspection are all you need. Replacing a battery unnecessarily is a common result of believing this particular myth.
6. You Should Inflate Tires to the Number on the Sidewall
The number on the tire sidewall is the maximum pressure, not the recommended pressure. Overinflating your tires can lead to reduced traction, faster wear, and even increased risk of a blowout. Instead, check the sticker inside your driver’s door or the owner’s manual for the correct pressure. Keeping your tires properly inflated improves fuel economy and keeps your ride safer. Don’t let this common car maintenance myth leave you riding on air—literally.
7. More Frequent Tune-Ups Mean Better Performance
The term “tune-up” is outdated and vague. In the past, it referred to adjusting things like carburetors and ignition timing systems that modern vehicles no longer use. Today’s cars rely on computers and sensors, and many components like spark plugs can last over 100,000 miles. Needlessly replacing parts or performing services too early is not only wasteful, it can actually introduce new problems. Follow your service schedule, and don’t let old terminology convince you to spend money you don’t need to.
Knowing the Truth Keeps Your Car—and Your Wallet—Running Smoothly
Falling for car maintenance myths doesn’t just cost you money—it can lead to unnecessary repairs, wasted time, and even long-term damage to your vehicle. By staying informed and questioning outdated advice, you can become a smarter car owner and a more confident decision-maker at the shop. Knowledge is your best tool under the hood. Ditch these myths, follow your manufacturer’s guidelines, and treat your car to the care it actually needs, not what someone told you back in 1995. Your car—and your bank account—will thank you for it.
Which of these car maintenance myths have you believed in the past? Share your experience—or your favorite myth-busting tip—in the comments below!
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Drew Blankenship is a former Porsche technician who writes and develops content full-time. He lives in North Carolina, where he enjoys spending time with his wife and two children. While Drew no longer gets his hands dirty modifying Porsches, he still loves motorsport and avidly watches Formula 1.