Mechanic’s red alert: The tiny task drivers skip that can wreck their ride

When it comes to keeping our cars running smoothly, most of us like to think we’re doing a pretty good job. 

After all, we fill up the tank, check the tyres every now and then, and maybe even give the windscreen a wipe when it gets a bit too grimy. 

But according to automotive experts, there’s one crucial maintenance rule that the majority of Aussie drivers are still getting wrong—and it could be costing us dearly in the long run.

So, what’s the big mistake? It’s all about oil changes—and more specifically, how often we’re actually doing them. 

The oil change myth: ‘She’ll be right’ isn’t always right

For decades, the old rule of thumb was to change your car’s oil every 10,000 kilometres or every six months, whichever came first. 

But with advances in engine technology and the introduction of synthetic oils, many modern vehicles can go much longer between changes. 

The trouble is, a lot of us are either sticking to outdated advice or, worse, stretching things out far too long.

Car expert and mechanic, Kazimieras Urbonas, says, ‘Oil doesn’t only wear out from distance—it breaks down over time regardless of how much you drive.’

‘I’ve seen engines with only 40,000 miles that needed complete rebuilds because the owner waited a full year between oil changes, thinking low mileage meant the oil was still good.’

Why oil changes matter more than you think

Oil is the lifeblood of your engine. It lubricates moving parts, reduces friction, and helps keep everything cool.

Over time, oil breaks down and gets contaminated with dirt, dust, and engine debris. If you don’t change it regularly, it can’t do its job—and that’s when problems start.

Neglecting oil changes can lead to:

• Reduced engine efficiency
• Increased fuel consumption
• Costly repairs (think: seized engines or worn-out components)
• Shortened vehicle lifespan

And for those of us who don’t drive as much anymore—perhaps you’re retired, working from home, or just not racking up the kilometres like you used to—it’s still important to change your oil based on time, not just distance. Oil degrades even when your car is sitting in the garage.

It’s not only a matter of mileage

A lot of people think that low mileage equals fewer oil breakdowns. But that is not always the case.

Oil has additives that neutralise acids and protect the engine from corrosion. These additive breakdowns over time regardless of how much you drive your car.

‘The engines we see fail before 100,000 miles usually show the same warning signs—oil sludge buildup and premature wear patterns that could have been prevented with consistent oil changes every six months,’ Ubonas says.

In fact, city driving makes your car more susceptible. ‘A car driven 2,000 miles in stop-and-go traffic actually needs fresh oil more urgently than one driven 4,000 highway miles,’ Urbonas says. 

‘The mileage number tells you nothing about what the oil has been through.

Other common maintenance mistakes

While we’re on the topic, here are a few other car care blunders that experts see all too often:

• Ignoring tyre pressure and tread depth
• Forgetting to replace air and cabin filters
• Skipping brake checks
• Overlooking coolant and transmission fluid levels

A little attention to these details can save you a lot of hassle (and money) down the track.

The bottom line: Read the manual, save your car

It might not be the most riveting read, but your car’s owner’s manual is packed with valuable information about how to keep your vehicle in top shape.

If you’re unsure about anything, don’t be afraid to ask your mechanic—that’s what they’re there for.

Your turn: What’s your car care routine?

Do you stick to a strict maintenance schedule, or do you tend to play it by ear? Have you ever paid the price for skipping an oil change or other routine service? Share your stories, tips, and questions in the comments below—we’d love to hear from you!

And remember: a little maintenance now can mean a lot less trouble (and expense) later. Safe motoring!

Also read: Don’t trust social media car tips until you read this auto expert’s warning