Debunking Common Car Maintenance Myths: What Every Driver Should Know
There’s a lot of car advice out there—some helpful, some outdated, and some that just won’t go away. Unfortunately, believing the wrong information can cost you money, lead to unnecessary repairs, and even compromise your safety.
At JustJoes, we believe in straightforward, honest car care. So, let’s set the record straight on some of the most common car maintenance myths.
1. You Need to Replace All Four Tires at Once
The Truth: Not always. If only two of your tires are worn out, you can replace just those—as long as they match your existing tires in brand, size, and tread pattern.
However, if you drive an all-wheel-drive (AWD) vehicle, replacing only two tires can cause uneven wear and stress on your drivetrain. When in doubt, let our team at JustJoes check your tires and recommend the best option.
2. Premium Gas Is Better for Your Engine
The Truth: Unless your vehicle specifically requires premium fuel, using it won’t improve performance or fuel economy.
Premium gas is designed for high-performance engines that need a higher octane level. If your owner’s manual says regular fuel is fine, there’s no benefit to using premium—just an extra cost at the pump.
3. You Should Warm Up Your Car for Several Minutes in Winter
The Truth: While it’s tempting to let your car idle on cold PEI mornings, modern engines don’t need long warm-up times.
In fact, idling for too long wastes fuel and isn’t great for your engine. Instead, let it run for 30 seconds to a minute, then start driving gently to allow the engine to warm up naturally.
If your car is struggling in the cold, it might be time for a battery or engine check at JustJoes Automotive.
4. Inflate Your Tires to the Number on the Sidewall
The Truth: That number is the maximum tire pressure, not the recommended level for your vehicle.
For the best performance, fuel efficiency, and safety, check the correct tire pressure on the sticker inside your driver’s door or in your owner’s manual. Need a quick tire pressure check? Stop by JustJoes, and we’ll take care of it.
5. If Your Brake Fluid Is Dark, It Needs to Be Replaced
The Truth: Brake fluid naturally darkens over time, but that doesn’t always mean it’s bad. The real issue is moisture contamination, which can reduce braking efficiency.
Instead of guessing, it’s best to have your brake fluid tested. Our team at JustJoes can check it and replace it if necessary.
6. Keeping Your Wiper Blade Arms Raised Prevents Ice Buildup
The Truth: This is a common winter trick, but it can actually weaken the wiper arm springs over time, leading to poor windshield contact and streaky wipers.
Instead, try using winter-rated wiper blades and applying a windshield cover or de-icer spray to prevent ice buildup. If your wipers aren’t clearing your windshield properly, JustJoes can help you find the right replacement.
7. Dish Soap Works Fine for Washing Your Car
The Truth: Dish soap is too harsh for your car’s paint and can strip away protective wax. Over time, this can lead to fading and damage.
For proper care, use a pH-balanced car shampoo or let JustJoes Automotive provide a professional clean that protects your vehicle’s finish.
8. A Dead Battery Means You Need a New One
The Truth: A dead battery doesn’t always mean it’s time for a replacement. Sometimes, the issue is:
- A faulty alternator
- Loose or corroded battery terminals
- Cold weather affecting battery performance
Before replacing your battery, let us test it at JustJoes to find the real cause—it could save you money.
9. Engine Flushes Are Necessary for Every Car
The Truth: While some shops push engine flushes as routine maintenance, most modern engines don’t need them if oil changes are done on time.
If your engine has sludge buildup, a flush might help, but unnecessary flushes can dislodge deposits and cause more harm than good. If you’re unsure, ask our experts at JustJoes for advice.
10. A Small Windshield Crack Isn’t a Big Deal
The Truth: Even minor chips and cracks can spread, especially with temperature changes and rough roads.
A small, inexpensive repair now can prevent the need for a full windshield replacement later. If you have a crack, bring it to JustJoes before it gets worse.
11. Water Can Replace Coolant in a Pinch
The Truth: While water might seem like a temporary fix, it doesn’t have the anti-freeze and anti-corrosion properties that coolant provides.
Using only water in your radiator can lead to overheating, freezing, and internal engine damage—especially in PEI’s colder months. Check your coolant levels regularly, and let JustJoes top them up if needed.
Honest, Reliable Car Care in PEI
At JustJoes, we’re here to help PEI drivers keep their vehicles in top shape—without unnecessary upsells or misinformation. Whether you need a routine oil change, brake service, tire replacement, or a full vehicle inspection, we’ve got you covered.
✔ Trusted by PEI drivers
✔ Experienced, honest mechanics
✔ Two Locations
Need expert advice or a service appointment? Contact JustJoes today!