Car maintenance is full of advice passed down like folklore, some of it once true, much of it now outdated, and some simply wrong.
This guide busts the five most common car maintenance myths and replaces them with what is actually true, so you spend your money where it counts rather than on habits that no longer apply. The aim is not to be contrarian, just accurate.
Here is what we cover:
- The most common maintenance myths
- The oil change interval myth
- The premium fuel myth
- The dealer-only servicing myth
- The facts worth keeping
What are the most common car maintenance myths?
The most common car maintenance myths are that oil must be changed every 5,000 kilometres, that premium fuel is always better, that only the dealer can service a new car, that a battery lasts until it dies with no warning, and that tyre pressure only matters for wear.
Most of these were reasonable advice decades ago and simply have not kept up with modern cars, oils and consumer law. A few of them cost you money for no benefit, while others could leave you stranded or paying more than you need to. What none of them do is replace the real fundamentals, which is why our guide to why regular servicing matters stays firmly grounded in what actually protects your car. The table below sets each myth against the fact.
| Myth | Fact |
|---|---|
| Oil every 5,000 km | Follow your car’s interval |
| Premium fuel always better | Only if your car requires it |
| Dealer-only servicing | Any qualified workshop, warranty-safe |
| Batteries fail without warning | Signs usually appear first |
| Tyre pressure is minor | Affects safety and economy too |
Are these myths harmful?
Some are. A few simply waste money, while others, like assuming a battery gives no warning, can leave you stranded when a quick test would have caught the problem early.
Where do they come from?
Often from advice that was once true. Older engines and oils did need more frequent changes, so the guidance made sense at the time and then stuck around past its use-by date.
Do you really need to change oil every 5,000 km?
No, you do not need to change oil every 5,000 kilometres on most modern cars, which use longer intervals with modern synthetic oils, so the correct interval is the one in your car’s handbook, not an old rule of thumb.
Modern synthetic oils and tighter-built engines are designed for longer service intervals, and many cars now go well beyond 10,000 kilometres between changes. Following the old 5,000 kilometre rule out of habit means paying for oil changes you do not need. The right number is always the one specified for your car, so check the handbook rather than the folklore when it comes to the oil change interval.
What’s the right interval?
Whatever your handbook specifies. Manufacturers set the interval based on the engine and the oil it uses, so that figure, not a generic rule, is the one to follow.
Can I change it more often?
You can, and it will not harm the engine, but on a modern car it is usually unnecessary spending. The handbook interval is designed to keep the engine well protected.
Is premium fuel and dealer-only servicing necessary?
Premium fuel is only necessary if your car requires it, and dealer-only servicing is a myth, since any qualified workshop servicing to the manufacturer’s schedule keeps your warranty valid under Australian Consumer Law.
Two myths for the price of one here. Premium fuel benefits engines designed to use it, but for most cars it delivers no advantage over the recommended grade, so it is simply a costlier fill. The dealer-only idea is even more persistent and just as wrong, as our explainer on whether independent servicing voids warranty makes clear. A qualified workshop offering warranty-safe logbook servicing can service to the manufacturer’s schedule and keep your new car warranty intact.
Do I need premium fuel?
Only if your car specifies it. For most cars the manufacturer-recommended grade is the correct and most cost-effective choice, and premium offers no real benefit.
Must I use the dealer?
No. Any qualified workshop servicing to the manufacturer’s schedule and stamping the logbook keeps your warranty valid. You are free to choose where your car is serviced.
What maintenance facts are worth keeping?
The maintenance facts worth keeping are to follow your car’s service schedule, use the fuel and oil it specifies, service with any qualified workshop, watch for battery warning signs, and keep tyres correctly inflated for safety and economy.
Strip away the myths and the real fundamentals are refreshingly simple. Stick to your car’s own schedule and specifications, and stay on top of general car servicing rather than relying on rules of thumb. Beyond that, a few everyday habits go a long way, which our guide to everyday maintenance habits sets out clearly.
If you are ever unsure whether a piece of advice still holds true for your car, our Brisbane mechanics are happy to give you a straight answer rather than leaving you to rely on something you read years ago that may no longer apply.
What’s the one rule to keep?
Follow your car’s own service schedule. It is set for your specific vehicle and reflects the real fundamentals, unlike the generic rules that get passed around.
Does tyre pressure matter beyond wear?
Yes. Correct tyre pressure affects grip and braking, fuel economy and comfort as well as wear, so it matters for safety, not just how long your tyres last.
Conclusion
Most maintenance myths are outdated rules of thumb that no longer fit modern cars. Following your car’s actual schedule and specifications, with any qualified workshop, is what really protects it, and it usually costs less than the folklore. If you would like to separate fact from myth for your own car, Car One Automotive is happy to set the record straight.
Frequently Asked Questions
Do I need to change my oil every 5,000 km?
Not usually. Most modern vehicles use high-quality synthetic oils and have longer service intervals recommended by the manufacturer. Always follow your owner’s handbook or service schedule rather than relying on the old 5,000 km rule of thumb.
Is premium fuel always better for my car?
No. Premium fuel only benefits vehicles specifically designed to use higher-octane fuel. If your manufacturer recommends regular unleaded, using premium fuel generally offers little or no performance or fuel economy advantage while increasing running costs.
Does servicing outside the dealer void my warranty?
No. Under Australian Consumer Law, your new car warranty remains valid when a qualified independent workshop services your vehicle according to the manufacturer’s schedule, uses appropriate parts and fluids, and correctly completes your logbook.
Do car batteries fail without any warning?
Usually not. Most batteries show warning signs such as slow engine cranking, dim headlights, electrical issues, or difficulty starting the vehicle. Having your battery tested during routine servicing can help prevent unexpected breakdowns.
Does tyre pressure only affect tyre wear?
No. Correct tyre pressure improves braking performance, handling, grip, fuel efficiency, ride comfort, and tyre life. Driving with tyres that are under- or over-inflated can reduce safety and increase operating costs over time.
